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java.lang.NullPointerException: 	at org.eclipse.e4.ui.internal.workbench.PartActivationHistory.activate(PartActivationHistory.java:52)	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:560)	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:531)	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:520)	at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2817)	at org.eclipse.ui.internal.WorkbenchPage.access$20(WorkbenchPage.java:2737)	at org.eclipse.ui.internal.WorkbenchPage$8.run(WorkbenchPage.java:2719)	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2715)	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2674)	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2657)	at org.eclipse.mylyn.tasks.ui.TasksUiUtil.openEditor(TasksUiUtil.java:182)	at org.eclipse.mylyn.internal.tasks.ui.util.TasksUiInternal.openTask(TasksUiInternal.java:920)	at org.eclipse.mylyn.tasks.ui.TasksUiUtil.openTask(TasksUiUtil.java:283)	at org.eclipse.mylyn.internal.tasks.ui.util.TasksUiInternal.refreshAndOpenTaskListElement(TasksUiInternal.java:306)	at org.eclipse.mylyn.internal.tasks.ui.actions.OpenTaskListElementAction.runWithEvent(OpenTaskListElementAction.java:56)	at org.eclipse.mylyn.internal.tasks.ui.actions.OpenTaskListElementAction.run(OpenTaskListElementAction.java:47)	at org.eclipse.mylyn.internal.tasks.ui.views.TaskListView$22.open(TaskListView.java:1308)	at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:866)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49)	at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)	at org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:864)	at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1152)	at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1256)	at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:275)	at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:269)	at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:309)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4165)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754)	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1015)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:909)	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:85)	at org.eclipse.ui.internal.Workbench$4.run(Workbench.java:580)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:535)	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)