Open Designer error ???? GWT 1.52

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Plug-in Provider: Instantiations
Plug-in Name: WindowBuilder Professional
Plug-in ID: com.swtdesigner
Plug-in Version: 6.7.1.200808291219

java.lang.IllegalArgumentException: Unable to find MethodDeclaration for appendChild (Lcom/google/gwt/dom/client/Node;)Lcom/google/gwt/dom/client/Node; in com.google.gwt.dom.client.Node
/**
* The Node interface is the primary datatype for the entire Document Object
* Model. It represents a single node in the document tree. While all objects
* implementing the Node interface expose methods for dealing with children, not
* all objects implementing the Node interface may have children.
*/
public class Node extends JavaScriptObject {

  /**
   * The node is an {@link Element}.
   */
  public static final short ELEMENT_NODE = 1;

  /**
   * The node is a {@link Text} node.
   */
  public static final short TEXT_NODE = 3;

  /**
   * The node is a {@link Document}.
   */
  public static final short DOCUMENT_NODE = 9;

  protected Node() {
  }

  /**
   * Adds the node newChild to the end of the list of children of this node. If
   * the newChild is already in the tree, it is first removed.
   *
   * @param newChild The node to add
   * @return The node added
   */
  public final native <T extends Node> T appendChild(T newChild) /*-{
    return this.appendChild(newChild);
  }-*/;

  /**
   * Returns a duplicate of this node, i.e., serves as a generic copy
   * constructor for nodes. The duplicate node has no parent; (parentNode is
   * null.).
   *
   * Cloning an Element copies all attributes and their values, including those
   * generated by the XML processor to represent defaulted attributes, but this
   * method does not copy any text it contains unless it is a deep clone, since
   * the text is contained in a child Text node. Cloning an Attribute directly,
   * as opposed to be cloned as part of an Element cloning operation, returns a
   * specified attribute (specified is true). Cloning any other type of node
   * simply returns a copy of this node.
   *
   * @param deep If true, recursively clone the subtree under the specified
   *          node; if false, clone only the node itself (and its attributes, if
   *          it is an {@link Element})
   * @return The duplicate node
   */
  public final native Node cloneNode(boolean deep) /*-{
    return this.cloneNode(deep);
  }-*/;

  /**
   * A NodeList that contains all children of this node. If there are no
   * children, this is a NodeList containing no nodes.
   */
  public final native NodeList<Node> getChildNodes() /*-{
    return this.childNodes;
  }-*/;

  /**
   * The first child of this node. If there is no such node, this returns null.
   */
  public final native Node getFirstChild() /*-{
    return this.firstChild;
  }-*/;

  /**
   * The last child of this node. If there is no such node, this returns null.
   */
  public final native Node getLastChild() /*-{
    return this.lastChild;
  }-*/;

  /**
   * The node immediately following this node. If there is no such node, this
   * returns null.
   */
  public final native Node getNextSibling() /*-{
    return this.nextSibling;
  }-*/;

  /**
   * The name of this node, depending on its type; see the table above.
   */
  public final native String getNodeName() /*-{
    return this.nodeName;
  }-*/;

  /**
   * A code representing the type of the underlying object, as defined above.
   */
  public final native short getNodeType() /*-{
    return this.nodeType;
  }-*/;

  /**
   * The value of this node, depending on its type; see the table above. When it
   * is defined to be null, setting it has no effect.
   */
  public final native String getNodeValue() /*-{
    return this.nodeValue;
  }-*/;

  /**
   * The Document object associated with this node. This is also the
   * {@link Document} object used to create new nodes.
   */
  public final native Document getOwnerDocument() /*-{
    return this.ownerDocument;
  }-*/;

  /**
   * The parent of this node. All nodes except Document may have a parent.
   * However, if a node has just been created and not yet added to the tree, or
   * if it has been removed from the tree, this is null.
   */
  public final native Node getParentNode() /*-{
    return this.parentNode;
  }-*/;

  /**
   * The node immediately preceding this node. If there is no such node, this
   * returns null.
   */
  public final native Node getPreviousSibling() /*-{
    return this.previousSibling;
  }-*/;

  /**
   * Returns whether this node has any children.
   */
  public final native boolean hasChildNodes() /*-{
    return this.hasChildNodes();
  }-*/;

  /**
   * Inserts the node newChild before the existing child node refChild. If
   * refChild is <code>null</code>, insert newChild at the end of the list of children.
   *
   * @param newChild The node to insert
   * @param refChild The reference node (that is, the node before which the new
   *          node must be inserted), or <code>null</code>
   * @return The node being inserted
   */
  public final native Node insertBefore(Node newChild, Node refChild) /*-{
    return this.insertBefore(newChild, refChild);
  }-*/;

  /**
   * Removes the child node indicated by oldChild from the list of children, and
   * returns it.
   *
   * @param oldChild The node being removed
   * @return The node removed
   */
  public final native Node removeChild(Node oldChild) /*-{
    return this.removeChild(oldChild);
  }-*/;

  /**
   * Replaces the child node oldChild with newChild in the list of children, and
   * returns the oldChild node.
   *
   * @param newChild The new node to put in the child list
   * @param oldChild The node being replaced in the list
   * @return The node replaced
   */
  public final native Node replaceChild(Node newChild, Node oldChild) /*-{
    return this.replaceChild(newChild, oldChild);
  }-*/;

  /**
   * The value of this node, depending on its type; see the table above. When it
   * is defined to be null, setting it has no effect.
   */
  public final native void setNodeValue(String nodeValue) /*-{
    this.nodeValue = nodeValue;
  }-*/;
}
    at com.swtdesigner.gwt.loader.compiler.GWTCompileVisitor.getMethod(GWTCompileVisitor.java:529)
    at com.swtdesigner.gwt.loader.compiler.GWTCompileVisitor.visitMethod(GWTCompileVisitor.java:91)
    at org.objectweb.asm.ClassReader.accept(Unknown Source)
    at org.objectweb.asm.ClassReader.accept(Unknown Source)
    at com.swtdesigner.gwt.loader.compiler.GWTClassCompiler.rewriteClass(GWTClassCompiler.java:28)
    at com.swtdesigner.gwt.loader.GWTClassLoader.findClass(GWTClassLoader.java:104)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:466)
    at com.swtdesigner.gwt.loader.GWTClassLoader.getClassFromBytes(GWTClassLoader.java:224)
    at com.swtdesigner.gwt.loader.GWTClassLoader.findClass(GWTClassLoader.java:116)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:466)
    at com.swtdesigner.gwt.loader.GWTClassLoader.getClassFromBytes(GWTClassLoader.java:224)
    at com.swtdesigner.gwt.loader.GWTClassLoader.findClass(GWTClassLoader.java:116)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
    at com.swtdesigner.gwt.model.widgets.support.GWTState.initClassesAndMethods(GWTState.java:416)
    at com.swtdesigner.gwt.model.widgets.support.GWTState.<init>(GWTState.java:136)
    at com.swtdesigner.gwt.support.browser.ie.GWTStateIE6.<init>(GWTStateIE6.java:29)
    at com.swtdesigner.gwt.support.browser.ie.BrowserSupportFactory.createState(BrowserSupportFactory.java:12)
    at com.swtdesigner.gwt.model.widgets.support.GWTState.createState(GWTState.java:1670)
    at com.swtdesigner.gwt.model.widgets.UIObjectInfo.getState(UIObjectInfo.java:412)
    at com.swtdesigner.gwt.model.widgets.UIObjectInfo.classByName(UIObjectInfo.java:186)
    at com.swtdesigner.gwt.model.widgets.UIObjectInfo.<init>(UIObjectInfo.java:68)
    at com.swtdesigner.gwt.model.widgets.WidgetInfo.<init>(WidgetInfo.java:55)
    at com.swtdesigner.gwt.model.widgets.panel.AbstractContainerInfo.<init>(AbstractContainerInfo.java:37)
    at com.swtdesigner.gwt.model.widgets.panel.PanelInfo.<init>(PanelInfo.java:25)
    at com.swtdesigner.gwt.model.widgets.panel.ComplexPanelInfo.<init>(ComplexPanelInfo.java:26)
    at com.swtdesigner.gwt.model.widgets.panel.AbsolutePanelInfo.<init>(AbsolutePanelInfo.java:36)
    at com.swtdesigner.gwt.model.widgets.panel.RootPanelInfo.<init>(RootPanelInfo.java:23)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at com.swtdesigner.gwt.model.GWTJavaInfoFactory.create(GWTJavaInfoFactory.java:163)
    at com.swtdesigner.model.parser.factory.JavaInfoFactory.create(JavaInfoFactory.java:113)
    at com.swtdesigner.model.parser.factory.JavaInfoFactory.create(JavaInfoFactory.java:96)
    at com.swtdesigner.model.parser.factory.JavaInfoFactory.create(JavaInfoFactory.java:89)
    at com.swtdesigner.model.parser.JavaInfoParser$ParserVisitor.isComponentCreation(JavaInfoParser.java:3781)
    at com.swtdesigner.model.parser.JavaInfoParser$ParserVisitor.endVisit(JavaInfoParser.java:1886)
    at org.eclipse.jdt.core.dom.MethodInvocation.accept0(MethodInvocation.java:247)
    at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2478)
    at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2525)
    at org.eclipse.jdt.core.dom.VariableDeclarationFragment.accept0(VariableDeclarationFragment.java:225)
    at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2478)
    at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2548)
    at org.eclipse.jdt.core.dom.VariableDeclarationStatement.accept0(VariableDeclarationStatement.java:273)
    at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2478)
    at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2548)
    at org.eclipse.jdt.core.dom.Block.accept0(Block.java:136)
    at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2478)
    at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2525)
    at org.eclipse.jdt.core.dom.MethodDeclaration.accept0(MethodDeclaration.java:502)
    at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2478)
    at com.swtdesigner.model.parser.JavaInfoParser$ParserVisitor.visit(JavaInfoParser.java:3018)
    at org.eclipse.jdt.core.dom.TypeDeclaration.accept0(TypeDeclaration.java:467)
    at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2478)
    at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2548)
    at org.eclipse.jdt.core.dom.CompilationUnit.accept0(CompilationUnit.java:214)
    at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2478)
    at com.swtdesigner.model.parser.JavaInfoParser.parse(JavaInfoParser.java:319)
    at com.swtdesigner.gef.DesignerEditor.parseCompilationUnit(DesignerEditor.java:1149)
    at com.swtdesigner.gef.DesignerEditor$17.execute(DesignerEditor.java:1077)
    at com.swtdesigner.model.swing.properties.custom.DesignTimeHelper.execute(DesignTimeHelper.java:54)
    at com.swtdesigner.gef.DesignerEditor.handleActivate(DesignerEditor.java:1071)
    at com.swtdesigner.gef.DesignerEditor.handleActivate(DesignerEditor.java:1062)
    at com.swtdesigner.editors.MultiPageEditor.showDesignEditor(MultiPageEditor.java:392)
    at com.swtdesigner.editors.MultiPageEditor$2.widgetSelected(MultiPageEditor.java:178)
    at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:228)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1027)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1012)
    at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:770)
    at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:3242)
    at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:2017)
    at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:320)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
    at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3823)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3422)
    at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2382)
    at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2346)
    at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2198)
    at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:493)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:288)
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:488)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
    at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113)
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:193)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:382)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:549)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:504)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1236)

Full stack trace (to see full context):
org.apache.commons.lang.exception.NestableError: org.apache.commons.lang.exception.NestableError: com.swtdesigner.properties.PropertyException: java.lang.reflect.InvocationTargetException
    at com.swtdesigner.model.parser.JavaInfoParser$ParserVisitor.isComponentCreation(JavaInfoParser.java:3792)
    at com.swtdesigner.model.parser.JavaInfoParser$ParserVisitor.endVisit(JavaInfoParser.java:1886)
    at org.eclipse.jdt.core.dom.MethodInvocation.accept0(MethodInvocation.java:247)
    at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2478)
    at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2525)
    at org.eclipse.jdt.core.dom.VariableDeclarationFragment.accept0(VariableDeclarationFragment.java:225)
    at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2478)
    at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2548)
    at org.eclipse.jdt.core.dom.VariableDeclarationStatement.accept0(VariableDeclarationStatement.java:273)
    at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2478)
    at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2548)
    at org.eclipse.jdt.core.dom.Block.accept0(Block.java:136)
    at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2478)
    at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2525)
    at org.eclipse.jdt.core.dom.MethodDeclaration.accept0(MethodDeclaration.java:502)
    at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2478)
    at com.swtdesigner.model.parser.JavaInfoParser$ParserVisitor.visit(JavaInfoParser.java:3018)
    at org.eclipse.jdt.core.dom.TypeDeclaration.accept0(TypeDeclaration.java:467)
    at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2478)
    at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2548)
    at org.eclipse.jdt.core.dom.CompilationUnit.accept0(CompilationUnit.java:214)
    at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2478)
    at com.swtdesigner.model.parser.JavaInfoParser.parse(JavaInfoParser.java:319)
    at com.swtdesigner.gef.DesignerEditor.parseCompilationUnit(DesignerEditor.java:1149)
    at com.swtdesigner.gef.DesignerEditor$17.execute(DesignerEditor.java:1077)
    at com.swtdesigner.model.swing.properties.custom.DesignTimeHelper.execute(DesignTimeHelper.java:54)
    at com.swtdesigner.gef.DesignerEditor.handleActivate(DesignerEditor.java:1071)
    at com.swtdesigner.gef.DesignerEditor.handleActivate(DesignerEditor.java:1062)
    at com.swtdesigner.editors.MultiPageEditor.showDesignEditor(MultiPageEditor.java:392)
    at com.swtdesigner.editors.MultiPageEditor$2.widgetSelected(MultiPageEditor.java:178)
    at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:228)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1027)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1012)
    at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:770)
    at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:3242)
    at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:2017)
    at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:320)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
    at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3823)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3422)
    at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2382)
    at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2346)
    at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2198)
    at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:493)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:288)
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:488)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
    at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113)
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:193)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:382)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:549)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:504)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1236)
Caused by: org.apache.commons.lang.exception.NestableError: com.swtdesigner.properties.PropertyException: java.lang.reflect.InvocationTargetException
    at com.swtdesigner.model.parser.factory.JavaInfoFactory.create(JavaInfoFactory.java:119)
    at com.swtdesigner.model.parser.factory.JavaInfoFactory.create(JavaInfoFactory.java:96)
    at com.swtdesigner.model.parser.factory.JavaInfoFactory.create(JavaInfoFactory.java:89)
    at com.swtdesigner.model.parser.JavaInfoParser$ParserVisitor.isComponentCreation(JavaInfoParser.java:3781)
    ... 62 more
Caused by: com.swtdesigner.properties.PropertyException: java.lang.reflect.InvocationTargetException
    at com.swtdesigner.gwt.model.GWTJavaInfoFactory.create(GWTJavaInfoFactory.java:171)
    at com.swtdesigner.model.parser.factory.JavaInfoFactory.create(JavaInfoFactory.java:113)
    ... 65 more
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at com.swtdesigner.gwt.model.GWTJavaInfoFactory.create(GWTJavaInfoFactory.java:163)
    ... 66 more
Caused by: org.apache.commons.lang.exception.NestableError: org.apache.commons.lang.exception.NestableError: org.apache.commons.lang.exception.NestableError: org.apache.commons.lang.exception.NestableError: Exception during loading of class com.google.gwt.user.client.Element
    at com.swtdesigner.gwt.model.widgets.UIObjectInfo.classByName(UIObjectInfo.java:188)
    at com.swtdesigner.gwt.model.widgets.UIObjectInfo.<init>(UIObjectInfo.java:68)
    at com.swtdesigner.gwt.model.widgets.WidgetInfo.<init>(WidgetInfo.java:55)
    at com.swtdesigner.gwt.model.widgets.panel.AbstractContainerInfo.<init>(AbstractContainerInfo.java:37)
    at com.swtdesigner.gwt.model.widgets.panel.PanelInfo.<init>(PanelInfo.java:25)
    at com.swtdesigner.gwt.model.widgets.panel.ComplexPanelInfo.<init>(ComplexPanelInfo.java:26)
    at com.swtdesigner.gwt.model.widgets.panel.AbsolutePanelInfo.<init>(AbsolutePanelInfo.java:36)
    at com.swtdesigner.gwt.model.widgets.panel.RootPanelInfo.<init>(RootPanelInfo.java:23)
    ... 71 more
Caused by: org.apache.commons.lang.exception.NestableError: org.apache.commons.lang.exception.NestableError: org.apache.commons.lang.exception.NestableError: Exception during loading of class com.google.gwt.user.client.Element
    at com.swtdesigner.gwt.model.widgets.UIObjectInfo.getState(UIObjectInfo.java:419)
    at com.swtdesigner.gwt.model.widgets.UIObjectInfo.classByName(UIObjectInfo.java:186)
    ... 78 more
Caused by: org.apache.commons.lang.exception.NestableError: org.apache.commons.lang.exception.NestableError: Exception during loading of class com.google.gwt.user.client.Element
    at com.swtdesigner.gwt.model.widgets.support.GWTState.<init>(GWTState.java:142)
    at com.swtdesigner.gwt.support.browser.ie.GWTStateIE6.<init>(GWTStateIE6.java:29)
    at com.swtdesigner.gwt.support.browser.ie.BrowserSupportFactory.createState(BrowserSupportFactory.java:12)
    at com.swtdesigner.gwt.model.widgets.support.GWTState.createState(GWTState.java:1670)
    at com.swtdesigner.gwt.model.widgets.UIObjectInfo.getState(UIObjectInfo.java:412)
    ... 79 more
Caused by: org.apache.commons.lang.exception.NestableError: Exception during loading of class com.google.gwt.user.client.Element
    at com.swtdesigner.gwt.loader.GWTClassLoader.findClass(GWTClassLoader.java:163)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
    at com.swtdesigner.gwt.model.widgets.support.GWTState.initClassesAndMethods(GWTState.java:416)
    at com.swtdesigner.gwt.model.widgets.support.GWTState.<init>(GWTState.java:136)
    ... 83 more
Caused by: org.apache.commons.lang.exception.NestableError: Exception during loading of class com.google.gwt.dom.client.Element
    at com.swtdesigner.gwt.loader.GWTClassLoader.findClass(GWTClassLoader.java:163)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:466)
    at com.swtdesigner.gwt.loader.GWTClassLoader.getClassFromBytes(GWTClassLoader.java:224)
    at com.swtdesigner.gwt.loader.GWTClassLoader.findClass(GWTClassLoader.java:116)
    ... 87 more
Caused by: org.apache.commons.lang.exception.NestableError: Exception during loading of class com.google.gwt.dom.client.Node
    at com.swtdesigner.gwt.loader.GWTClassLoader.findClass(GWTClassLoader.java:163)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:466)
    at com.swtdesigner.gwt.loader.GWTClassLoader.getClassFromBytes(GWTClassLoader.java:224)
    at com.swtdesigner.gwt.loader.GWTClassLoader.findClass(GWTClassLoader.java:116)
    ... 95 more
Caused by: org.apache.commons.lang.exception.NestableError: org.apache.commons.lang.exception.NestableError: java.lang.IllegalArgumentException: Unable to find MethodDeclaration for appendChild (Lcom/google/gwt/dom/client/Node;)Lcom/google/gwt/dom/client/Node; in com.google.gwt.dom.client.Node
/**
* The Node interface is the primary datatype for the entire Document Object
* Model. It represents a single node in the document tree. While all objects
* implementing the Node interface expose methods for dealing with children, not
* all objects implementing the Node interface may have children.
*/
public class Node extends JavaScriptObject {

  /**
   * The node is an {@link Element}.
   */
  public static final short ELEMENT_NODE = 1;

  /**
   * The node is a {@link Text} node.
   */
  public static final short TEXT_NODE = 3;

  /**
   * The node is a {@link Document}.
   */
  public static final short DOCUMENT_NODE = 9;

  protected Node() {
  }

  /**
   * Adds the node newChild to the end of the list of children of this node. If
   * the newChild is already in the tree, it is first removed.
   *
   * @param newChild The node to add
   * @return The node added
   */
  public final native <T extends Node> T appendChild(T newChild) /*-{
    return this.appendChild(newChild);
  }-*/;

  /**
   * Returns a duplicate of this node, i.e., serves as a generic copy
   * constructor for nodes. The duplicate node has no parent; (parentNode is
   * null.).
   *
   * Cloning an Element copies all attributes and their values, including those
   * generated by the XML processor to represent defaulted attributes, but this
   * method does not copy any text it contains unless it is a deep clone, since
   * the text is contained in a child Text node. Cloning an Attribute directly,
   * as opposed to be cloned as part of an Element cloning operation, returns a
   * specified attribute (specified is true). Cloning any other type of node
   * simply returns a copy of this node.
   *
   * @param deep If true, recursively clone the subtree under the specified
   *          node; if false, clone only the node itself (and its attributes, if
   *          it is an {@link Element})
   * @return The duplicate node
   */
  public final native Node cloneNode(boolean deep) /*-{
    return this.cloneNode(deep);
  }-*/;

  /**
   * A NodeList that contains all children of this node. If there are no
   * children, this is a NodeList containing no nodes.
   */
  public final native NodeList<Node> getChildNodes() /*-{
    return this.childNodes;
  }-*/;

  /**
   * The first child of this node. If there is no such node, this returns null.
   */
  public final native Node getFirstChild() /*-{
    return this.firstChild;
  }-*/;

  /**
   * The last child of this node. If there is no such node, this returns null.
   */
  public final native Node getLastChild() /*-{
    return this.lastChild;
  }-*/;

  /**
   * The node immediately following this node. If there is no such node, this
   * returns null.
   */
  public final native Node getNextSibling() /*-{
    return this.nextSibling;
  }-*/;

  /**
   * The name of this node, depending on its type; see the table above.
   */
  public final native String getNodeName() /*-{
    return this.nodeName;
  }-*/;

  /**
   * A code representing the type of the underlying object, as defined above.
   */
  public final native short getNodeType() /*-{
    return this.nodeType;
  }-*/;

  /**
   * The value of this node, depending on its type; see the table above. When it
   * is defined to be null, setting it has no effect.
   */
  public final native String getNodeValue() /*-{
    return this.nodeValue;
  }-*/;

  /**
   * The Document object associated with this node. This is also the
   * {@link Document} object used to create new nodes.
   */
  public final native Document getOwnerDocument() /*-{
    return this.ownerDocument;
  }-*/;

  /**
   * The parent of this node. All nodes except Document may have a parent.
   * However, if a node has just been created and not yet added to the tree, or
   * if it has been removed from the tree, this is null.
   */
  public final native Node getParentNode() /*-{
    return this.parentNode;
  }-*/;

  /**
   * The node immediately preceding this node. If there is no such node, this
   * returns null.
   */
  public final native Node getPreviousSibling() /*-{
    return this.previousSibling;
  }-*/;

  /**
   * Returns whether this node has any children.
   */
  public final native boolean hasChildNodes() /*-{
    return this.hasChildNodes();
  }-*/;

  /**
   * Inserts the node newChild before the existing child node refChild. If
   * refChild is <code>null</code>, insert newChild at the end of the list of children.
   *
   * @param newChild The node to insert
   * @param refChild The reference node (that is, the node before which the new
   *          node must be inserted), or <code>null</code>
   * @return The node being inserted
   */
  public final native Node insertBefore(Node newChild, Node refChild) /*-{
    return this.insertBefore(newChild, refChild);
  }-*/;

  /**
   * Removes the child node indicated by oldChild from the list of children, and
   * returns it.
   *
   * @param oldChild The node being removed
   * @return The node removed
   */
  public final native Node removeChild(Node oldChild) /*-{
    return this.removeChild(oldChild);
  }-*/;

  /**
   * Replaces the child node oldChild with newChild in the list of children, and
   * returns the oldChild node.
   *
   * @param newChild The new node to put in the child list
   * @param oldChild The node being replaced in the list
   * @return The node replaced
   */
  public final native Node replaceChild(Node newChild, Node oldChild) /*-{
    return this.replaceChild(newChild, oldChild);
  }-*/;

  /**
   * The value of this node, depending on its type; see the table above. When it
   * is defined to be null, setting it has no effect.
   */
  public final native void setNodeValue(String nodeValue) /*-{
    this.nodeValue = nodeValue;
  }-*/;
}
    at com.swtdesigner.gwt.loader.compiler.GWTClassCompiler.rewriteClass(GWTClassCompiler.java:49)
    at com.swtdesigner.gwt.loader.GWTClassLoader.findClass(GWTClassLoader.java:104)
    ... 103 more
Caused by: org.apache.commons.lang.exception.NestableError: java.lang.IllegalArgumentException: Unable to find MethodDeclaration for appendChild (Lcom/google/gwt/dom/client/Node;)Lcom/google/gwt/dom/client/Node; in com.google.gwt.dom.client.Node
/**
* The Node interface is the primary datatype for the entire Document Object
* Model. It represents a single node in the document tree. While all objects
* implementing the Node interface expose methods for dealing with children, not
* all objects implementing the Node interface may have children.
*/
public class Node extends JavaScriptObject {

  /**
   * The node is an {@link Element}.
   */
  public static final short ELEMENT_NODE = 1;

  /**
   * The node is a {@link Text} node.
   */
  public static final short TEXT_NODE = 3;

  /**
   * The node is a {@link Document}.
   */
  public static final short DOCUMENT_NODE = 9;

  protected Node() {
  }

  /**
   * Adds the node newChild to the end of the list of children of this node. If
   * the newChild is already in the tree, it is first removed.
   *
   * @param newChild The node to add
   * @return The node added
   */
  public final native <T extends Node> T appendChild(T newChild) /*-{
    return this.appendChild(newChild);
  }-*/;

  /**
   * Returns a duplicate of this node, i.e., serves as a generic copy
   * constructor for nodes. The duplicate node has no parent; (parentNode is
   * null.).
   *
   * Cloning an Element copies all attributes and their values, including those
   * generated by the XML processor to represent defaulted attributes, but this
   * method does not copy any text it contains unless it is a deep clone, since
   * the text is contained in a child Text node. Cloning an Attribute directly,
   * as opposed to be cloned as part of an Element cloning operation, returns a
   * specified attribute (specified is true). Cloning any other type of node
   * simply returns a copy of this node.
   *
   * @param deep If true, recursively clone the subtree under the specified
   *          node; if false, clone only the node itself (and its attributes, if
   *          it is an {@link Element})
   * @return The duplicate node
   */
  public final native Node cloneNode(boolean deep) /*-{
    return this.cloneNode(deep);
  }-*/;

  /**
   * A NodeList that contains all children of this node. If there are no
   * children, this is a NodeList containing no nodes.
   */
  public final native NodeList<Node> getChildNodes() /*-{
    return this.childNodes;
  }-*/;

  /**
   * The first child of this node. If there is no such node, this returns null.
   */
  public final native Node getFirstChild() /*-{
    return this.firstChild;
  }-*/;

  /**
   * The last child of this node. If there is no such node, this returns null.
   */
  public final native Node getLastChild() /*-{
    return this.lastChild;
  }-*/;

  /**
   * The node immediately following this node. If there is no such node, this
   * returns null.
   */
  public final native Node getNextSibling() /*-{
    return this.nextSibling;
  }-*/;

  /**
   * The name of this node, depending on its type; see the table above.
   */
  public final native String getNodeName() /*-{
    return this.nodeName;
  }-*/;

  /**
   * A code representing the type of the underlying object, as defined above.
   */
  public final native short getNodeType() /*-{
    return this.nodeType;
  }-*/;

  /**
   * The value of this node, depending on its type; see the table above. When it
   * is defined to be null, setting it has no effect.
   */
  public final native String getNodeValue() /*-{
    return this.nodeValue;
  }-*/;

  /**
   * The Document object associated with this node. This is also the
   * {@link Document} object used to create new nodes.
   */
  public final native Document getOwnerDocument() /*-{
    return this.ownerDocument;
  }-*/;

  /**
   * The parent of this node. All nodes except Document may have a parent.
   * However, if a node has just been created and not yet added to the tree, or
   * if it has been removed from the tree, this is null.
   */
  public final native Node getParentNode() /*-{
    return this.parentNode;
  }-*/;

  /**
   * The node immediately preceding this node. If there is no such node, this
   * returns null.
   */
  public final native Node getPreviousSibling() /*-{
    return this.previousSibling;
  }-*/;

  /**
   * Returns whether this node has any children.
   */
  public final native boolean hasChildNodes() /*-{
    return this.hasChildNodes();
  }-*/;

  /**
   * Inserts the node newChild before the existing child node refChild. If
   * refChild is <code>null</code>, insert newChild at the end of the list of children.
   *
   * @param newChild The node to insert
   * @param refChild The reference node (that is, the node before which the new
   *          node must be inserted), or <code>null</code>
   * @return The node being inserted
   */
  public final native Node insertBefore(Node newChild, Node refChild) /*-{
    return this.insertBefore(newChild, refChild);
  }-*/;

  /**
   * Removes the child node indicated by oldChild from the list of children, and
   * returns it.
   *
   * @param oldChild The node being removed
   * @return The node removed
   */
  public final native Node removeChild(Node oldChild) /*-{
    return this.removeChild(oldChild);
  }-*/;

  /**
   * Replaces the child node oldChild with newChild in the list of children, and
   * returns the oldChild node.
   *
   * @param newChild The new node to put in the child list
   * @param oldChild The node being replaced in the list
   * @return The node replaced
   */
  public final native Node replaceChild(Node newChild, Node oldChild) /*-{
    return this.replaceChild(newChild, oldChild);
  }-*/;

  /**
   * The value of this node, depending on its type; see the table above. When it
   * is defined to be null, setting it has no effect.
   */
  public final native void setNodeValue(String nodeValue) /*-{
    this.nodeValue = nodeValue;
  }-*/;
}
    at com.swtdesigner.gwt.loader.compiler.GWTCompileVisitor.visitMethod(GWTCompileVisitor.java:119)
    at org.objectweb.asm.ClassReader.accept(Unknown Source)
    at org.objectweb.asm.ClassReader.accept(Unknown Source)
    at com.swtdesigner.gwt.loader.compiler.GWTClassCompiler.rewriteClass(GWTClassCompiler.java:28)
    ... 104 more
Caused by: java.lang.IllegalArgumentException: Unable to find MethodDeclaration for appendChild (Lcom/google/gwt/dom/client/Node;)Lcom/google/gwt/dom/client/Node; in com.google.gwt.dom.client.Node
/**
* The Node interface is the primary datatype for the entire Document Object
* Model. It represents a single node in the document tree. While all objects
* implementing the Node interface expose methods for dealing with children, not
* all objects implementing the Node interface may have children.
*/
public class Node extends JavaScriptObject {

  /**
   * The node is an {@link Element}.
   */
  public static final short ELEMENT_NODE = 1;

  /**
   * The node is a {@link Text} node.
   */
  public static final short TEXT_NODE = 3;

  /**
   * The node is a {@link Document}.
   */
  public static final short DOCUMENT_NODE = 9;

  protected Node() {
  }

  /**
   * Adds the node newChild to the end of the list of children of this node. If
   * the newChild is already in the tree, it is first removed.
   *
   * @param newChild The node to add
   * @return The node added
   */
  public final native <T extends Node> T appendChild(T newChild) /*-{
    return this.appendChild(newChild);
  }-*/;

  /**
   * Returns a duplicate of this node, i.e., serves as a generic copy
   * constructor for nodes. The duplicate node has no parent; (parentNode is
   * null.).
   *
   * Cloning an Element copies all attributes and their values, including those
   * generated by the XML processor to represent defaulted attributes, but this
   * method does not copy any text it contains unless it is a deep clone, since
   * the text is contained in a child Text node. Cloning an Attribute directly,
   * as opposed to be cloned as part of an Element cloning operation, returns a
   * specified attribute (specified is true). Cloning any other type of node
   * simply returns a copy of this node.
   *
   * @param deep If true, recursively clone the subtree under the specified
   *          node; if false, clone only the node itself (and its attributes, if
   *          it is an {@link Element})
   * @return The duplicate node
   */
  public final native Node cloneNode(boolean deep) /*-{
    return this.cloneNode(deep);
  }-*/;

  /**
   * A NodeList that contains all children of this node. If there are no
   * children, this is a NodeList containing no nodes.
   */
  public final native NodeList<Node> getChildNodes() /*-{
    return this.childNodes;
  }-*/;

  /**
   * The first child of this node. If there is no such node, this returns null.
   */
  public final native Node getFirstChild() /*-{
    return this.firstChild;
  }-*/;

  /**
   * The last child of this node. If there is no such node, this returns null.
   */
  public final native Node getLastChild() /*-{
    return this.lastChild;
  }-*/;

  /**
   * The node immediately following this node. If there is no such node, this
   * returns null.
   */
  public final native Node getNextSibling() /*-{
    return this.nextSibling;
  }-*/;

  /**
   * The name of this node, depending on its type; see the table above.
   */
  public final native String getNodeName() /*-{
    return this.nodeName;
  }-*/;

  /**
   * A code representing the type of the underlying object, as defined above.
   */
  public final native short getNodeType() /*-{
    return this.nodeType;
  }-*/;

  /**
   * The value of this node, depending on its type; see the table above. When it
   * is defined to be null, setting it has no effect.
   */
  public final native String getNodeValue() /*-{
    return this.nodeValue;
  }-*/;

  /**
   * The Document object associated with this node. This is also the
   * {@link Document} object used to create new nodes.
   */
  public final native Document getOwnerDocument() /*-{
    return this.ownerDocument;
  }-*/;

  /**
   * The parent of this node. All nodes except Document may have a parent.
   * However, if a node has just been created and not yet added to the tree, or
   * if it has been removed from the tree, this is null.
   */
  public final native Node getParentNode() /*-{
    return this.parentNode;
  }-*/;

  /**
   * The node immediately preceding this node. If there is no such node, this
   * returns null.
   */
  public final native Node getPreviousSibling() /*-{
    return this.previousSibling;
  }-*/;

  /**
   * Returns whether this node has any children.
   */
  public final native boolean hasChildNodes() /*-{
    return this.hasChildNodes();
  }-*/;

  /**
   * Inserts the node newChild before the existing child node refChild. If
   * refChild is <code>null</code>, insert newChild at the end of the list of children.
   *
   * @param newChild The node to insert
   * @param refChild The reference node (that is, the node before which the new
   *          node must be inserted), or <code>null</code>
   * @return The node being inserted
   */
  public final native Node insertBefore(Node newChild, Node refChild) /*-{
    return this.insertBefore(newChild, refChild);
  }-*/;

  /**
   * Removes the child node indicated by oldChild from the list of children, and
   * returns it.
   *
   * @param oldChild The node being removed
   * @return The node removed
   */
  public final native Node removeChild(Node oldChild) /*-{
    return this.removeChild(oldChild);
  }-*/;

  /**
   * Replaces the child node oldChild with newChild in the list of children, and
   * returns the oldChild node.
   *
   * @param newChild The new node to put in the child list
   * @param oldChild The node being replaced in the list
   * @return The node replaced
   */
  public final native Node replaceChild(Node newChild, Node oldChild) /*-{
    return this.replaceChild(newChild, oldChild);
  }-*/;

  /**
   * The value of this node, depending on its type; see the table above. When it
   * is defined to be null, setting it has no effect.
   */
  public final native void setNodeValue(String nodeValue) /*-{
    this.nodeValue = nodeValue;
  }-*/;
}
    at com.swtdesigner.gwt.loader.compiler.GWTCompileVisitor.getMethod(GWTCompileVisitor.java:529)
    at com.swtdesigner.gwt.loader.compiler.GWTCompileVisitor.visitMethod(GWTCompileVisitor.java:91)
    ... 107 more

Designer Configuration Details:

Product: WindowBuilder Professional
Version: 6.7.1.200808291219
Expected: Eclipse 3.4
Actual: Eclipse 3.4.0.v20080512
Actual Eclipse Build Name:
Actual Eclipse Build ID: I20080617-2000
IDE Actual Name: Eclipse
IDE Actual Version: 3.3.100.v200806172000
IDE Actual NL: zh_CN
Serial Number: WindowBuilderPro-71794-3720
Activation Key: SWTDesignerEval-BM0SH-PM0ZN-9K2EM
Physical Address: 00-16-CF-00-39-02
Code Gen: Flat Mode, Use Existing, First Assignment, Make Final
Events: Anonymous Class
GWT Home: D:/soft/java/gwt-SDK
Platform Product: Eclipse
Platform Version: 3.3.100.v200806172000
OS Name: Windows XP
OS Architecture: x86
OS Version: 5.1


[Eric Clayberg]

Looks like an installation problem of some sort as you appear to be still running an older version of GWT Designer that does not work with GWT 1.5.

I would suggest doing a clean install of the latest build GWT Designer v5.1.0 into a clean Eclipse 3.4 environment.