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org.eclipse.core.commands.common.NotDefinedException: Cannot get the parent identifier from an undefined context. org.eclipse.ui.actionSet.openFiles	at org.eclipse.core.commands.contexts.Context.getParentId(Context.java:201)	at org.eclipse.e4.ui.bindings.internal.ContextSet$CComp.getLevel(ContextSet.java:48)	at org.eclipse.e4.ui.bindings.internal.ContextSet$CComp.compare(ContextSet.java:37)	at org.eclipse.e4.ui.bindings.internal.ContextSet$CComp.compare(ContextSet.java:1)	at java.util.TimSort.binarySort(TimSort.java:265)	at java.util.TimSort.sort(TimSort.java:190)	at java.util.TimSort.sort(TimSort.java:173)	at java.util.Arrays.sort(Arrays.java:659)	at java.util.Collections.sort(Collections.java:217)	at org.eclipse.e4.ui.bindings.internal.ContextSet.(ContextSet.java:76)	at org.eclipse.e4.ui.bindings.internal.BindingTableManager.createContextSet(BindingTableManager.java:90)	at org.eclipse.e4.ui.bindings.internal.BindingTableManager.addTable(BindingTableManager.java:50)	at org.eclipse.e4.ui.workbench.swt.util.BindingProcessingAddon$1.handleEvent(BindingProcessingAddon.java:319)	at org.eclipse.e4.ui.services.internal.events.UIEventHandler$1.run(UIEventHandler.java:41)	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:4688)	at org.eclipse.e4.ui.internal.workbench.swt.E4Application$1.syncExec(E4Application.java:205)	at org.eclipse.e4.ui.services.internal.events.UIEventHandler.handleEvent(UIEventHandler.java:38)	at org.eclipse.equinox.internal.event.EventHandlerWrapper.handleEvent(EventHandlerWrapper.java:197)	at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:197)	at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:1)	at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)	at org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148)	at org.eclipse.equinox.internal.event.EventAdminImpl.dispatchEvent(EventAdminImpl.java:135)	at org.eclipse.equinox.internal.event.EventAdminImpl.sendEvent(EventAdminImpl.java:78)	at org.eclipse.equinox.internal.event.EventComponent.sendEvent(EventComponent.java:39)	at org.eclipse.e4.ui.services.internal.events.EventBroker.send(EventBroker.java:80)	at org.eclipse.e4.ui.internal.workbench.UIEventPublisher.notifyChanged(UIEventPublisher.java:58)	at org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:374)	at org.eclipse.emf.ecore.util.EcoreEList.dispatchNotification(EcoreEList.java:249)	at org.eclipse.emf.common.notify.impl.NotifyingListImpl.addUnique(NotifyingListImpl.java:294)	at org.eclipse.emf.common.util.AbstractEList.add(AbstractEList.java:303)	at org.eclipse.ui.internal.Workbench.defineBindingTable(Workbench.java:2080)	at org.eclipse.ui.internal.Workbench.access$33(Workbench.java:2070)	at org.eclipse.ui.internal.Workbench$43$1.contextManagerChanged(Workbench.java:2164)	at org.eclipse.core.commands.contexts.ContextManager.fireContextManagerChanged(ContextManager.java:165)	at org.eclipse.core.commands.contexts.ContextManager.contextChanged(ContextManager.java:143)	at org.eclipse.core.commands.contexts.Context.fireContextChanged(Context.java:183)	at org.eclipse.core.commands.contexts.Context.define(Context.java:157)	at org.eclipse.ui.internal.registry.ActionSetRegistry.addActionSet(ActionSetRegistry.java:111)	at org.eclipse.ui.internal.registry.ActionSetRegistry.addActionSets(ActionSetRegistry.java:291)	at org.eclipse.ui.internal.registry.ActionSetRegistry.readFromRegistry(ActionSetRegistry.java:217)	at org.eclipse.ui.internal.registry.ActionSetRegistry.(ActionSetRegistry.java:74)	at org.eclipse.ui.internal.WorkbenchPlugin$5.compute(WorkbenchPlugin.java:1402)	at org.eclipse.e4.core.internal.contexts.ValueComputation.get(ValueComputation.java:61)	at org.eclipse.e4.core.internal.contexts.EclipseContext.internalGet(EclipseContext.java:242)	at org.eclipse.e4.core.internal.contexts.EclipseContext.get(EclipseContext.java:209)	at org.eclipse.e4.core.internal.contexts.EclipseContext.get(EclipseContext.java:567)	at org.eclipse.ui.internal.e4.compatibility.ModeledPageLayout.(ModeledPageLayout.java:179)	at org.eclipse.ui.internal.WorkbenchPage.setPerspective(WorkbenchPage.java:3907)	at org.eclipse.ui.internal.WorkbenchWindow.setup(WorkbenchWindow.java:675)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:56)	at org.eclipse.e4.core.internal.di.InjectorImpl.processAnnotated(InjectorImpl.java:877)	at org.eclipse.e4.core.internal.di.InjectorImpl.inject(InjectorImpl.java:119)	at org.eclipse.e4.core.internal.di.InjectorImpl.inject(InjectorImpl.java:84)	at org.eclipse.e4.core.contexts.ContextInjectionFactory.inject(ContextInjectionFactory.java:73)	at org.eclipse.ui.internal.Workbench.createWorkbenchWindow(Workbench.java:1400)	at org.eclipse.ui.internal.Workbench.getActiveWorkbenchWindow(Workbench.java:1373)	at org.eclipse.ui.internal.services.WorkbenchSourceProvider.updateActiveShell(WorkbenchSourceProvider.java:924)	at org.eclipse.ui.internal.services.WorkbenchSourceProvider.getCurrentState(WorkbenchSourceProvider.java:133)	at org.eclipse.ui.internal.services.WorkbenchSourceProvider$6.handleEvent(WorkbenchSourceProvider.java:684)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)	at org.eclipse.swt.widgets.Display.filterEvent(Display.java:1262)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1056)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1081)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1066)	at org.eclipse.swt.widgets.Decorations.WM_ACTIVATE(Decorations.java:1667)	at org.eclipse.swt.widgets.Shell.WM_ACTIVATE(Shell.java:2151)	at org.eclipse.swt.widgets.Control.windowProc(Control.java:4608)	at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:340)	at org.eclipse.swt.widgets.Decorations.windowProc(Decorations.java:1627)	at org.eclipse.swt.widgets.Shell.windowProc(Shell.java:2075)	at org.eclipse.swt.widgets.Display.windowProc(Display.java:4977)	at org.eclipse.swt.internal.win32.OS.BringWindowToTop(Native Method)	at org.eclipse.swt.widgets.Decorations.bringToTop(Decorations.java:231)	at org.eclipse.swt.widgets.Shell.open(Shell.java:1217)	at org.eclipse.e4.ui.workbench.renderers.swt.WBWRenderer.postProcess(WBWRenderer.java:674)	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:649)	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:735)	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$2(PartRenderingEngine.java:706)	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$7.run(PartRenderingEngine.java:700)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:685)	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1038)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:331)	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:997)	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:140)	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:611)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:331)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:567)	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)	at my.rcp.gefeditor.Application.start(Application.java:20)	at rcp.core.handlers.OpenTheEditorHandler.execute(OpenTheEditorHandler.java:13)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:56)	at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:243)	at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:224)	at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:132)	at org.eclipse.e4.core.commands.internal.HandlerServiceHandler.execute(HandlerServiceHandler.java:167)	at org.eclipse.core.commands.Command.executeWithChecks(Command.java:499)	at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:508)	at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:213)	at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.executeItem(HandledContributionItem.java:850)	at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.handleWidgetSelection(HandledContributionItem.java:743)	at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.access$7(HandledContributionItem.java:727)	at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem$4.handleEvent(HandledContributionItem.java:662)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1057)	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4170)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3759)	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1113)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:331)	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:997)	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:140)	at org.eclipse.e4.ui.internal.workbench.swt.E4Application.start(E4Application.java:162)	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:354)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:181)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:636)	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:591)	at org.eclipse.equinox.launcher.Main.run(Main.java:1450)	at org.eclipse.equinox.launcher.Main.main(Main.java:1426)