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org.eclipse.jface.util.Assert$AssertionFailedException: null argument;	at org.eclipse.jface.util.Assert.isNotNull(Assert.java:149)	at org.eclipse.jface.util.Assert.isNotNull(Assert.java:125)	at org.eclipse.ui.internal.PartList.partVisible(PartList.java:227)	at org.eclipse.ui.internal.PartList.access$2(PartList.java:219)	at org.eclipse.ui.internal.PartList$1.propertyChanged(PartList.java:37)	at org.eclipse.ui.internal.WorkbenchPartReference.fireInternalPropertyChange(WorkbenchPartReference.java:351)	at org.eclipse.ui.internal.WorkbenchPartReference.fireVisibilityChange(WorkbenchPartReference.java:502)	at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:271)	at org.eclipse.ui.internal.presentations.PresentablePart.setVisible(PresentablePart.java:126)	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:391)	at org.eclipse.ui.internal.PartStack.refreshPresentationSelection(PartStack.java:1064)	at org.eclipse.ui.internal.PartStack.setSelection(PartStack.java:1013)	at org.eclipse.ui.internal.WorkbenchPage.internalBringToTop(WorkbenchPage.java:692)	at org.eclipse.ui.internal.WorkbenchPage.activate(WorkbenchPage.java:530)	at com.m7.wide.eclipse.jstudio.A.requestFocus(Unknown Source)	at com.m7.wide.doceditor.AbstractEditor.requestFocus(Unknown Source)	at com.m7.wide.doceditor.AbstractPane.requestFocus(Unknown Source)	at com.m7.wide.doceditor.flow.FlowDesignPane.requestFocus(Unknown Source)	at com.m7.wide.doceditor.CompoundPane.requestFocus(Unknown Source)	at com.m7.wide.doceditor.CompoundPane.setHidden(Unknown Source)	at com.m7.wide.doceditor.MultiPaneEditor.activePaneChanged(Unknown Source)	at com.m7.wide.eclipse.jstudio.PaneEditorPart.activate(Unknown Source)	at com.m7.wide.eclipse.jstudio.DynamicMultiPageEditor.A(Unknown Source)	at com.m7.wide.eclipse.jstudio.DynamicMultiPageEditor.pageChange(Unknown Source)	at com.m7.wide.eclipse.jstudio.DynamicMultiPageEditor.createPages(Unknown Source)	at org.eclipse.ui.part.MultiPageEditorPart.createPartControl(MultiPageEditorPart.java:241)	at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:577)