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java.lang.NullPointerException: 	at org.eclipse.swt.widgets.MenuItem.getAccelGroup(MenuItem.java:316)	at org.eclipse.swt.widgets.MenuItem.setEnabled(MenuItem.java:657)	at org.eclipse.ui.menus.CommandContributionItem.updateMenuItem(CommandContributionItem.java:631)	at org.eclipse.ui.menus.CommandContributionItem.update(CommandContributionItem.java:580)	at org.eclipse.jface.action.MenuManager.update(MenuManager.java:880)	at org.eclipse.jface.action.MenuManager.update(MenuManager.java:880)	at org.eclipse.jface.action.MenuManager.update(MenuManager.java:880)	at org.eclipse.ui.internal.Workbench.updateActiveWorkbenchWindowMenuManager(Workbench.java:3337)	at org.eclipse.ui.internal.Workbench.access$0(Workbench.java:3299)	at org.eclipse.ui.internal.Workbench$1.windowActivated(Workbench.java:3264)	at org.eclipse.ui.internal.Workbench$14.run(Workbench.java:1002)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.ui.internal.Workbench.fireWindowActivated(Workbench.java:1000)	at org.eclipse.ui.internal.WorkbenchWindow$28.shellActivated(WorkbenchWindow.java:3141)	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:88)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1258)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1282)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1263)	at org.eclipse.swt.widgets.Shell.filterProc(Shell.java:731)	at org.eclipse.swt.widgets.Display.filterProc(Display.java:1543)	at org.eclipse.swt.internal.gtk.OS._g_main_context_iteration(Native Method)	at org.eclipse.swt.internal.gtk.OS.g_main_context_iteration(OS.java:2258)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3207)	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2696)	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2660)	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494)	at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667)	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123)	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:344)	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:597)	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622)	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)	at org.eclipse.equinox.launcher.Main.run(Main.java:1410)	at org.eclipse.equinox.launcher.Main.main(Main.java:1386)