[rules-dev] Cannot open Guvnor GWT classes with GWT Designer

[jreynolds1982]

I am using Eclipse Helios (3.6) with a Maven plugin and Google Web Toolkit.
When I try to use GWT Designer to view any classes in the Guvnor source, i
get the following error:

Any Suggestions would be GREATLY appreciated!

java.lang.NoSuchMethodError:
com.google.gdt.eclipse.designer.model.widgets.support.GwtState.getCSSFiles()Ljava/util/List;
	at
com.google.gdt.eclipse.designer.gxt.parser.ClassLoaderValidator.hasRequiredStyles(ClassLoaderValidator.java:89)
	at
com.google.gdt.eclipse.designer.gxt.parser.ClassLoaderValidator.validate(ClassLoaderValidator.java:45)
	at
com.google.gdt.eclipse.designer.parser.ParseFactory.validate(ParseFactory.java:465)
	at
com.google.gdt.eclipse.designer.parser.ParseFactory.getClassLoader(ParseFactory.java:433)
	at
org.eclipse.wb.internal.core.parser.AbstractParseFactory.initializeClassLoader(AbstractParseFactory.java:732)
	at
com.google.gdt.eclipse.designer.parser.ParseFactory.getRootContext(ParseFactory.java:103)
	at
org.eclipse.wb.internal.core.parser.JavaInfoParser.prepareParseContext(JavaInfoParser.java:1185)
	at
org.eclipse.wb.internal.core.parser.JavaInfoParser.parse(JavaInfoParser.java:244)
	at
org.eclipse.wb.internal.core.parser.JavaInfoParser.access$9(JavaInfoParser.java:240)
	at
org.eclipse.wb.internal.core.parser.JavaInfoParser$1.runObject(JavaInfoParser.java:153)
	at
org.eclipse.wb.internal.core.parser.JavaInfoParser$1.runObject(JavaInfoParser.java:1)
	at
org.eclipse.wb.internal.core.utils.execution.ExecutionUtils.runDesignTime(ExecutionUtils.java:153)
	at
org.eclipse.wb.internal.core.parser.JavaInfoParser.parse(JavaInfoParser.java:151)
	at
org.eclipse.wb.internal.core.editor.DesignPage.internal_refreshGEF(DesignPage.java:513)
	at
org.eclipse.wb.internal.core.editor.DesignPage.access$9(DesignPage.java:501)
	at
org.eclipse.wb.internal.core.editor.DesignPage$8$1.run(DesignPage.java:434)
	at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:179)
	at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:150)
	at org.eclipse.swt.widgets.Display.syncExec(Display.java:4584)
	at
org.eclipse.wb.internal.core.editor.DesignPage$8.run(DesignPage.java:431)
	at
org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:464)
	at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:372)
	at
org.eclipse.jface.dialogs.ProgressMonitorDialog.run(ProgressMonitorDialog.java:507)
	at
org.eclipse.wb.internal.core.editor.DesignPage.internal_refreshGEF_withProgress(DesignPage.java:450)
	at
org.eclipse.wb.internal.core.editor.DesignPage.internal_refreshGEF(DesignPage.java:400)
	at
org.eclipse.wb.internal.core.editor.UndoManager.refreshDesignerEditor(UndoManager.java:381)
	at
org.eclipse.wb.internal.core.editor.UndoManager.activate(UndoManager.java:90)
	at
org.eclipse.wb.internal.core.editor.DesignPage.handleActiveState_True(DesignPage.java:248)
	at
org.eclipse.wb.internal.core.editor.DesignPage.handleActiveState(DesignPage.java:226)
	at
org.eclipse.wb.internal.core.editor.multi.DefaultMultiMode.showPage(DefaultMultiMode.java:125)
	at
org.eclipse.wb.internal.core.editor.multi.DefaultMultiMode$1.widgetSelected(DefaultMultiMode.java:63)
	at
org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:234)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1077)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1062)
	at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:774)
	at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:2743)
	at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:1429)
	at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:257)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4066)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3657)
	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2640)
	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604)
	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438)
	at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671)
	at
org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at
org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
	at
org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)
	at
org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
	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:369)
	at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:619)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1407)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1383)


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