Hello,
i'm using following infrastructure:
Eclipse 4.2.1 
GWT Designer 2.6.0.r42x201206111253
GWT 2.5_RC 2

Problem is, that I can't choose MenuBar or MenuItem in GWT Designer Palette.

If I open a class with a menubar, i get following error:

org.eclipse.wb.internal.core.utils.exception.DesignerException: 502 (Unable to 
load *.wbp-component.xml description.). com.google.gwt.user.client.ui.MenuBar
        at 
org.eclipse.wb.internal.core.model.description.helpers.ComponentDescriptionHelper.getDescription0(ComponentDescriptionHelper.java:442)
        at 
org.eclipse.wb.internal.core.model.description.helpers.ComponentDescriptionHelper.getDescription0(ComponentDescriptionHelper.java:289)
        at 
org.eclipse.wb.internal.core.model.description.helpers.ComponentDescriptionHelper.getDescription(ComponentDescriptionHelper.java:258)
        at 
org.eclipse.wb.internal.core.model.JavaInfoUtils.createJavaInfo(JavaInfoUtils.java:386)
        at 
org.eclipse.wb.internal.core.parser.AbstractParseFactory.createInstance(AbstractParseFactory.java:504)
        at 
org.eclipse.wb.internal.core.parser.AbstractParseFactory.create(AbstractParseFactory.java:174)
        at 
com.google.gdt.eclipse.designer.parser.ParseFactory.create(ParseFactory.java:173)
        at 
org.eclipse.wb.internal.core.parser.JavaInfoParser$ExecutionFlowParseVisitor.endVisit(JavaInfoParser.java:696)
        at sun.reflect.GeneratedMethodAccessor68.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils$1.intercept(ExecutionFlowUtils.java:401)
        at 
org.eclipse.jdt.core.dom.ASTVisitor$$EnhancerByCGLIB$$787a56ff.endVisit(<generated>)
        at 
org.eclipse.jdt.core.dom.ClassInstanceCreation.accept0(ClassInstanceCreation.java:337)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2514)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2562)
        at org.eclipse.jdt.core.dom.Assignment.accept0(Assignment.java:312)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2514)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2562)
        at 
org.eclipse.jdt.core.dom.ExpressionStatement.accept0(ExpressionStatement.java:144)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2514)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:355)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:337)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:348)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:337)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visit(ExecutionFlowUtils.java:248)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.access$1(ExecutionFlowUtils.java:236)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils$1.endVisit(ExecutionFlowUtils.java:444)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils$1.intercept(ExecutionFlowUtils.java:393)
        at 
org.eclipse.jdt.core.dom.ASTVisitor$$EnhancerByCGLIB$$787a56ff.endVisit(<generated>)
        at 
org.eclipse.jdt.core.dom.MethodInvocation.accept0(MethodInvocation.java:247)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2514)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2585)
        at 
org.eclipse.jdt.core.dom.MethodInvocation.accept0(MethodInvocation.java:245)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2514)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2562)
        at 
org.eclipse.jdt.core.dom.ExpressionStatement.accept0(ExpressionStatement.java:144)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2514)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:355)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:337)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:348)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:337)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visit(ExecutionFlowUtils.java:248)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.access$1(ExecutionFlowUtils.java:236)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils$1.endVisit(ExecutionFlowUtils.java:444)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils$1.intercept(ExecutionFlowUtils.java:393)
        at 
org.eclipse.jdt.core.dom.ASTVisitor$$EnhancerByCGLIB$$787a56ff.endVisit(<generated>)
        at 
org.eclipse.jdt.core.dom.MethodInvocation.accept0(MethodInvocation.java:247)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2514)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2585)
        at 
org.eclipse.jdt.core.dom.MethodInvocation.accept0(MethodInvocation.java:245)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2514)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2562)
        at 
org.eclipse.jdt.core.dom.ExpressionStatement.accept0(ExpressionStatement.java:144)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2514)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:355)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:337)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:348)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:337)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visit(ExecutionFlowUtils.java:248)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.access$1(ExecutionFlowUtils.java:236)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils$1.endVisit(ExecutionFlowUtils.java:444)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils$1.intercept(ExecutionFlowUtils.java:393)
        at 
org.eclipse.jdt.core.dom.ASTVisitor$$EnhancerByCGLIB$$787a56ff.endVisit(<generated>)
        at 
org.eclipse.jdt.core.dom.MethodInvocation.accept0(MethodInvocation.java:247)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2514)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2585)
        at 
org.eclipse.jdt.core.dom.MethodInvocation.accept0(MethodInvocation.java:245)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2514)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2562)
        at 
org.eclipse.jdt.core.dom.ExpressionStatement.accept0(ExpressionStatement.java:144)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2514)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:355)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:337)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:348)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:337)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visit(ExecutionFlowUtils.java:248)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.access$1(ExecutionFlowUtils.java:236)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils$1.endVisit(ExecutionFlowUtils.java:444)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils$1.intercept(ExecutionFlowUtils.java:393)
        at 
org.eclipse.jdt.core.dom.ASTVisitor$$EnhancerByCGLIB$$787a56ff.endVisit(<generated>)
        at 
org.eclipse.jdt.core.dom.MethodInvocation.accept0(MethodInvocation.java:247)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2514)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2585)
        at 
org.eclipse.jdt.core.dom.MethodInvocation.accept0(MethodInvocation.java:245)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2514)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2562)
        at 
org.eclipse.jdt.core.dom.ExpressionStatement.accept0(ExpressionStatement.java:144)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2514)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:355)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:337)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:348)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:337)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visit(ExecutionFlowUtils.java:248)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.access$1(ExecutionFlowUtils.java:236)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils$1.endVisit(ExecutionFlowUtils.java:444)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils$1.intercept(ExecutionFlowUtils.java:393)
        at 
org.eclipse.jdt.core.dom.ASTVisitor$$EnhancerByCGLIB$$787a56ff.endVisit(<generated>)
        at 
org.eclipse.jdt.core.dom.MethodInvocation.accept0(MethodInvocation.java:247)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2514)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2585)
        at 
org.eclipse.jdt.core.dom.MethodInvocation.accept0(MethodInvocation.java:245)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2514)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2562)
        at 
org.eclipse.jdt.core.dom.ExpressionStatement.accept0(ExpressionStatement.java:144)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2514)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:355)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:337)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:348)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:337)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visit(ExecutionFlowUtils.java:248)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.access$1(ExecutionFlowUtils.java:236)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils$1.endVisit(ExecutionFlowUtils.java:444)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils$1.intercept(ExecutionFlowUtils.java:393)
        at 
org.eclipse.jdt.core.dom.ASTVisitor$$EnhancerByCGLIB$$787a56ff.endVisit(<generated>)
        at 
org.eclipse.jdt.core.dom.MethodInvocation.accept0(MethodInvocation.java:247)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2514)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2585)
        at 
org.eclipse.jdt.core.dom.MethodInvocation.accept0(MethodInvocation.java:245)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2514)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2562)
        at 
org.eclipse.jdt.core.dom.ExpressionStatement.accept0(ExpressionStatement.java:144)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2514)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:355)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:337)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visit(ExecutionFlowUtils.java:248)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.access$1(ExecutionFlowUtils.java:236)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils$1.endVisit(ExecutionFlowUtils.java:444)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils$1.intercept(ExecutionFlowUtils.java:393)
        at 
org.eclipse.jdt.core.dom.ASTVisitor$$EnhancerByCGLIB$$787a56ff.endVisit(<generated>)
        at 
org.eclipse.jdt.core.dom.MethodInvocation.accept0(MethodInvocation.java:247)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2514)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2562)
        at 
org.eclipse.jdt.core.dom.ExpressionStatement.accept0(ExpressionStatement.java:144)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2514)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:355)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:337)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:348)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement0(ExecutionFlowUtils.java:337)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visitStatement(ExecutionFlowUtils.java:316)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visit(ExecutionFlowUtils.java:248)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visit(ExecutionFlowUtils.java:229)
        at 
org.eclipse.wb.core.eval.ExecutionFlowUtils.visit(ExecutionFlowUtils.java:192)
        at 
org.eclipse.wb.internal.core.parser.JavaInfoParser.parseRootMethods(JavaInfoParser.java:314)
        at 
org.eclipse.wb.internal.core.parser.JavaInfoParser.parse(JavaInfoParser.java:270)
        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:537)
        at 
org.eclipse.wb.internal.core.editor.DesignPage.access$9(DesignPage.java:525)
        at 
org.eclipse.wb.internal.core.editor.DesignPage$8$1.run(DesignPage.java:452)
        at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:180)
        at 
org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:150)
        at org.eclipse.swt.widgets.Display.syncExec(Display.java:4687)
        at 
org.eclipse.wb.internal.core.editor.DesignPage$8.run(DesignPage.java:449)
        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:468)
        at 
org.eclipse.wb.internal.core.editor.DesignPage.internal_refreshGEF(DesignPage.java:418)
        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:266)
        at 
org.eclipse.wb.internal.core.editor.DesignPage.handleActiveState(DesignPage.java:244)
        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:248)
        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:3023)
        at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:1730)
        at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:270)
        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:4169)
        at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3758)
        at 
org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1029)
        at 
org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
        at 
org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:923)
        at 
org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:86)
        at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:588)
        at 
org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
        at 
org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:543)
        at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
        at 
org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124)
        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:353)
        at 
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:180)
        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:629)
        at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584)
        at org.eclipse.equinox.launcher.Main.run(Main.java:1438)
        at org.eclipse.equinox.launcher.Main.main(Main.java:1414)
Caused by: org.eclipse.wb.internal.core.utils.check.AssertionFailedException: 
No such method 
com.google.gwt.user.client.ui.MenuBar.addItem(java.lang.String,boolean,com.google.gwt.user.client.Command)
 during parsing com.google.gwt.user.client.ui.MenuBar
        at org.eclipse.wb.internal.core.utils.check.Assert.fail(Assert.java:225)
        at 
org.eclipse.wb.internal.core.utils.check.Assert.isNotNull2(Assert.java:209)
        at 
org.eclipse.wb.internal.core.model.description.rules.MethodRule.getReflectionMethod(MethodRule.java:102)
        at 
org.eclipse.wb.internal.core.model.description.rules.MethodRule.configureWithReflectionMethod(MethodRule.java:94)
        at 
org.eclipse.wb.internal.core.model.description.rules.MethodRule.configureEnd(MethodRule.java:90)
        at 
org.eclipse.wb.internal.core.model.description.rules.MethodRule.end(MethodRule.java:80)
        at org.apache.commons.digester.Digester.endElement(Digester.java:1332)
        at 
com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(Unknown 
Source)
        at 
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown
 Source)
        at 
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown
 Source)
        at 
com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown 
Source)
        at 
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
 Source)
        at 
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown 
Source)
        at 
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown 
Source)
        at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown 
Source)
        at 
com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown 
Source)
        at 
com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown
 Source)
        at org.apache.commons.digester.Digester.parse(Digester.java:1887)
        at 
org.eclipse.wb.internal.core.model.description.helpers.ComponentDescriptionHelper.getDescription0(ComponentDescriptionHelper.java:389)
        ... 231 more


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