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java.lang.NullPointerException: 	at org.eclipse.ui.actions.RetargetAction.partDeactivated(RetargetAction.java:186)	at org.eclipse.ui.internal.PartService$4.run(PartService.java:123)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.ui.internal.PartService.partDeactivated(PartService.java:120)	at org.eclipse.ui.internal.WorkbenchPage$18.run(WorkbenchPage.java:5030)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.ui.internal.WorkbenchPage.firePartDeactivated(WorkbenchPage.java:5027)	at org.eclipse.ui.internal.WorkbenchPage.access$21(WorkbenchPage.java:5020)	at org.eclipse.ui.internal.WorkbenchPage$E4PartListener.partDeactivated(WorkbenchPage.java:222)	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl$4.run(PartServiceImpl.java:266)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.firePartDeactivated(PartServiceImpl.java:263)	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:688)	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.setPart(PartServiceImpl.java:221)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:54)	at org.eclipse.e4.core.internal.contexts.ContextObjectSupplier$ContextInjectionListener.update(ContextObjectSupplier.java:90)	at org.eclipse.e4.core.internal.contexts.TrackableComputationExt.update(TrackableComputationExt.java:111)	at org.eclipse.e4.core.internal.contexts.EclipseContext.processScheduled(EclipseContext.java:343)	at org.eclipse.e4.core.internal.contexts.EclipseContext.set(EclipseContext.java:358)	at org.eclipse.e4.core.internal.contexts.EclipseContext.dispose(EclipseContext.java:197)	at org.eclipse.e4.core.internal.contexts.EclipseContext.dispose(EclipseContext.java:161)	at org.eclipse.e4.core.internal.contexts.EclipseContext.dispose(EclipseContext.java:161)	at org.eclipse.e4.core.internal.contexts.EclipseContext.dispose(EclipseContext.java:161)	at org.eclipse.e4.core.internal.contexts.EclipseContext.dispose(EclipseContext.java:161)	at org.eclipse.e4.core.internal.contexts.osgi.EclipseContextOSGi.dispose(EclipseContextOSGi.java:106)	at org.eclipse.e4.core.internal.contexts.osgi.EclipseContextOSGi.bundleChanged(EclipseContextOSGi.java:139)	at org.eclipse.osgi.internal.framework.BundleContextImpl.dispatchEvent(BundleContextImpl.java:903)	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.osgi.internal.framework.EquinoxEventPublisher.publishBundleEventPrivileged(EquinoxEventPublisher.java:213)	at org.eclipse.osgi.internal.framework.EquinoxEventPublisher.publishBundleEvent(EquinoxEventPublisher.java:120)	at org.eclipse.osgi.internal.framework.EquinoxEventPublisher.publishBundleEvent(EquinoxEventPublisher.java:112)	at org.eclipse.osgi.internal.framework.EquinoxContainerAdaptor.publishModuleEvent(EquinoxContainerAdaptor.java:156)	at org.eclipse.osgi.container.Module.publishEvent(Module.java:476)	at org.eclipse.osgi.container.Module.doStop(Module.java:634)	at org.eclipse.osgi.container.Module.stop(Module.java:498)	at org.eclipse.osgi.container.SystemModule.stop(SystemModule.java:191)	at org.eclipse.osgi.internal.framework.EquinoxBundle$SystemBundle$EquinoxSystemModule$1.run(EquinoxBundle.java:165)	at java.lang.Thread.run(Thread.java:745)