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

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) -- View this message in context: http://drools.46999.n3.nabble.com/Cannot-open-Guvnor-GWT-classes-with-GWT... 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