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java.lang.NullPointerException: 	at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:3087)	at org.eclipse.ui.internal.WorkbenchPage.access$21(WorkbenchPage.java:2996)	at org.eclipse.ui.internal.WorkbenchPage$8.run(WorkbenchPage.java:2978)	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2974)	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2933)	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2924)	at org.eclipse.ui.ide.IDE.openEditor(IDE.java:655)	at org.eclipse.ui.ide.IDE.openEditor(IDE.java:614)	at org.eclipse.ui.internal.ide.handlers.OpenResourceHandler.execute(OpenResourceHandler.java:129)	at org.eclipse.ui.internal.ide.handlers.OpenResourceHandler.run(OpenResourceHandler.java:181)	at org.eclipse.ui.internal.handlers.ActionDelegateHandlerProxy.execute(ActionDelegateHandlerProxy.java:295)	at org.eclipse.ui.internal.handlers.E4HandlerProxy.execute(E4HandlerProxy.java:76)	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.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:56)	at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:229)	at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:210)	at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:131)	at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:171)	at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.executeCommand(KeyBindingDispatcher.java:276)	at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.press(KeyBindingDispatcher.java:494)	at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.processKeyEvent(KeyBindingDispatcher.java:545)	at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.filterKeySequenceBindings(KeyBindingDispatcher.java:366)	at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.access$0(KeyBindingDispatcher.java:313)	at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher$KeyDownFilter.handleEvent(KeyBindingDispatcher.java:82)	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:1052)	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.sendKeyEvent(Widget.java:1104)	at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1100)	at org.eclipse.swt.widgets.Widget.wmChar(Widget.java:1521)	at org.eclipse.swt.widgets.Control.WM_CHAR(Control.java:4640)	at org.eclipse.swt.widgets.ToolBar.WM_CHAR(ToolBar.java:1244)	at org.eclipse.swt.widgets.Control.windowProc(Control.java:4528)	at org.eclipse.swt.widgets.Display.windowProc(Display.java:4989)	at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method)	at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:2546)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3756)	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1022)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:916)	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:86)	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:585)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:540)	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(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)	at org.eclipse.equinox.launcher.Main.main(Main.java:1414)