error when switching to design view

[ilia@lobsanov.com]

I'm somewhat new to eclipse and GWT, so please bear with me. When i switch from Source to Design on the EntryPoint class, i get a popup "parse error or internal Designer error".

The details>> button shows the following...

Plug-in Provider: Instantiations
Plug-in Name: GWT Designer Evaluation
Plug-in ID: com.swtdesigner
Plug-in Version: 5.1.0.200808291252

java.lang.NoClassDefFoundError: org/eclipse/jdt/core/dom/AnonymousTypeDeclaration
at com.swtdesigner.model.parser.JavaInfoParser.parse(JavaInfoParser.java:305)
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:1561)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1585)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1570)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1360)
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:1561)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1585)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1570)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1360)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3474)
at org.eclipse.swt.widgets.Control.sendTrackEvents(Control.java:3024)
at org.eclipse.swt.widgets.Control.actionProc(Control.java:122)
at org.eclipse.swt.widgets.Display.actionProc(Display.java:362)
at org.eclipse.swt.internal.carbon.OS.CallNextEventHandler(Native Method)
at org.eclipse.swt.widgets.Widget.kEventControlTrack(Widget.java:1106)
at org.eclipse.swt.widgets.Control.kEventControlTrack(Control.java:2097)
at org.eclipse.swt.widgets.Widget.controlProc(Widget.java:375)
at org.eclipse.swt.widgets.Display.controlProc(Display.java:862)
at org.eclipse.swt.internal.carbon.OS.SendEventToEventTarget(Native Method)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3047)
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:585)
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)

Designer Configuration Details:

Product: GWT Designer Evaluation
Version: 5.1.0.200808291252
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: en_US
Activation Key: GWTDesignerEval-HM0SH-PN0JX-KCRED
Physical Address: 00-1C-42-00-00-00, HardwareAddress[00-1C-42-00-00-01], HardwareAddress[00-19-E3-34-F0-7E]
Code Gen: Flat Mode, Use Existing, First Assignment, Make Final
Events: Anonymous Class
GWT Home: /Applications/gwt-mac-1.5.2
Platform Product: Eclipse
Platform Version: 3.3.100.v200806172000
OS Name: Mac OS X
OS Architecture: i386
OS Version: 10.5.4

[Eric Clayberg]

What exact Eclipse distribution are you using?

Is the PDE installed? That is a required prefreq for GWT Designer.

How exactly did you install GWT Designer? From ZIP file or Update Site? If Update Site, did you install the entire product or part of it?

When fully installed via the Update Manager, it should look something like this...