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org.eclipse.core.runtime.AssertionFailedException: null argument:	at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:86)	at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:74)	at org.eclipse.ui.internal.EditorSite.(EditorSite.java:46)	at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:464)	at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:594)	at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:306)	at org.eclipse.ui.internal.presentations.PresentablePart.setVisible(PresentablePart.java:180)	at org.eclipse.ui.internal.presentations.util.PresentablePartFolder.select(PresentablePartFolder.java:270)	at org.eclipse.ui.internal.presentations.util.LeftToRightTabOrder.select(LeftToRightTabOrder.java:65)	at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation.selectPart(TabbedStackPresentation.java:473)	at org.eclipse.ui.internal.PartStack.refreshPresentationSelection(PartStack.java:1256)	at org.eclipse.ui.internal.PartStack.handleDeferredEvents(PartStack.java:1224)	at org.eclipse.ui.internal.LayoutPart.deferUpdates(LayoutPart.java:400)	at org.eclipse.ui.internal.PartSashContainer.handleDeferredEvents(PartSashContainer.java:1401)	at org.eclipse.ui.internal.LayoutPart.deferUpdates(LayoutPart.java:400)	at org.eclipse.ui.internal.WorkbenchPage.handleDeferredEvents(WorkbenchPage.java:1383)	at org.eclipse.ui.internal.WorkbenchPage.deferUpdates(WorkbenchPage.java:1373)	at org.eclipse.ui.internal.WorkbenchPage.access$14(WorkbenchPage.java:1364)	at org.eclipse.ui.internal.WorkbenchPage$15.runWithException(WorkbenchPage.java:3261)	at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:133)	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3378)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3036)	at org.eclipse.ui.application.WorkbenchAdvisor.openWindows(WorkbenchAdvisor.java:803)	at org.eclipse.ui.internal.Workbench$27.runWithException(Workbench.java:1363)	at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:133)	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3378)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3036)	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2295)	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2200)	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:495)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:288)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:490)	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113)	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:193)	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:386)	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:585)	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:549)	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:504)	at org.eclipse.equinox.launcher.Main.run(Main.java:1236)