java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.eclipse.ui.internal.menus.MenuAdditionCacheEntry.createToolBarAdditionContribution(MenuAdditionCacheEntry.java:208)
at org.eclipse.ui.internal.menus.MenuAdditionCacheEntry.createContributionItems(MenuAdditionCacheEntry.java:177)
at org.eclipse.ui.internal.WorkbenchWindow.updateLayoutDataForContents(WorkbenchWindow.java:3874)
at org.eclipse.ui.internal.WorkbenchWindow.setCoolBarVisible(WorkbenchWindow.java:3675)
at org.eclipse.ui.internal.ViewIntroAdapterPart.setBarVisibility(ViewIntroAdapterPart.java:203)
at org.eclipse.ui.internal.ViewIntroAdapterPart.dispose(ViewIntroAdapterPart.java:106)
at org.eclipse.ui.internal.WorkbenchPartReference.doDisposePart(WorkbenchPartReference.java:737)
at org.eclipse.ui.internal.ViewReference.doDisposePart(ViewReference.java:107)
at org.eclipse.ui.internal.WorkbenchPartReference.dispose(WorkbenchPartReference.java:684)
at org.eclipse.ui.internal.WorkbenchPage.disposePart(WorkbenchPage.java:1801)
at org.eclipse.ui.internal.WorkbenchPage.partRemoved(WorkbenchPage.java:1793)
at org.eclipse.ui.internal.ViewFactory.releaseView(ViewFactory.java:257)
at org.eclipse.ui.internal.Perspective.dispose(Perspective.java:292)
at org.eclipse.ui.internal.WorkbenchPage.dispose(WorkbenchPage.java:1872)
at org.eclipse.ui.internal.WorkbenchWindow.closeAllPages(WorkbenchWindow.java:894)
at org.eclipse.ui.internal.WorkbenchWindow.hardClose(WorkbenchWindow.java:1729)
at org.eclipse.ui.internal.WorkbenchWindow.busyClose(WorkbenchWindow.java:730)
at org.eclipse.ui.internal.WorkbenchWindow.access$0(WorkbenchWindow.java:715)
at org.eclipse.ui.internal.WorkbenchWindow$6.run(WorkbenchWindow.java:867)
at org.eclipse.ui.internal.WorkbenchWindow.close(WorkbenchWindow.java:865)
at org.eclipse.ui.internal.Workbench.busyClose(Workbench.java:1111)
at org.eclipse.ui.internal.Workbench.access$15(Workbench.java:1040)
at org.eclipse.ui.internal.Workbench.close(Workbench.java:1282)
at org.eclipse.ui.internal.Workbench.close(Workbench.java:1254)
at org.eclipse.ui.internal.WorkbenchWindow.busyClose(WorkbenchWindow.java:727)
at org.eclipse.ui.internal.WorkbenchWindow.access$0(WorkbenchWindow.java:715)
at org.eclipse.ui.internal.WorkbenchWindow$6.run(WorkbenchWindow.java:867)
at org.eclipse.ui.internal.WorkbenchWindow.close(WorkbenchWindow.java:865)
at org.eclipse.jface.window.Window.handleShellCloseEvent(Window.java:741)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:98)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1276)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1300)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1285)
at org.eclipse.swt.widgets.Shell.closeWidget(Shell.java:617)
at org.eclipse.swt.widgets.Shell.gtk_delete_event(Shell.java:1191)
at org.eclipse.swt.widgets.Widget.windowProc(Widget.java:1750)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:5116)
at org.eclipse.swt.internal.gtk.OS._gtk_main_do_event(Native Method)
at org.eclipse.swt.internal.gtk.OS.gtk_main_do_event(OS.java:8295)
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:2332)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2701)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2665)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2499)
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 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:601)
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)

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