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org.eclipse.core.runtime.AssertionFailedException: null argument:A part's title tool tip must be non-null	at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:84)	at org.eclipse.ui.internal.PartTester.testWorkbenchPart(PartTester.java:109)	at org.eclipse.ui.internal.PartTester.testEditor(PartTester.java:37)	at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:671)	at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:426)	at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:592)	at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:299)	at org.eclipse.ui.internal.presentations.PresentablePart.setVisible(PresentablePart.java:179)	at org.eclipse.ui.internal.presentations.util.PresentablePartFolder.select(PresentablePartFolder.java:268)	at org.eclipse.ui.internal.presentations.util.LeftToRightTabOrder.select(LeftToRightTabOrder.java:65)	at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation.selectPart(TabbedStackPresentation.java:400)	at org.eclipse.ui.internal.PartStack.refreshPresentationSelection(PartStack.java:1256)	at org.eclipse.ui.internal.PartStack.setSelection(PartStack.java:1209)	at org.eclipse.ui.internal.PartStack.showPart(PartStack.java:1604)	at org.eclipse.ui.internal.PartStack.add(PartStack.java:499)	at org.eclipse.ui.internal.EditorStack.add(EditorStack.java:103)	at org.eclipse.ui.internal.PartStack.add(PartStack.java:485)	at org.eclipse.ui.internal.EditorStack.add(EditorStack.java:112)	at org.eclipse.ui.internal.EditorSashContainer.addEditor(EditorSashContainer.java:63)	at org.eclipse.ui.internal.EditorAreaHelper.addToLayout(EditorAreaHelper.java:217)	at org.eclipse.ui.internal.EditorAreaHelper.addEditor(EditorAreaHelper.java:207)	at org.eclipse.ui.internal.EditorManager.createEditorTab(EditorManager.java:774)	at org.eclipse.ui.internal.EditorManager.openEditorFromDescriptor(EditorManager.java:673)	at org.eclipse.ui.internal.EditorManager.openEditor(EditorManager.java:634)	at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2737)	at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2651)	at org.eclipse.ui.internal.WorkbenchPage.access$13(WorkbenchPage.java:2643)	at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2595)	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67)	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2590)	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2574)	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2565)