org.eclipse.core.runtime.AssertionFailedException: null argument:

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org.eclipse.core.runtime.AssertionFailedException: null argument:
at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:86)
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.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.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.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.ui.internal.Workbench$27.runWithException(Workbench.java:1363)
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.ui.internal.Workbench.runUI(Workbench.java:2295)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2200)
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 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)

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