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org.eclipse.ui.internal.misc.AssertionFailedException: null argument;	at org.eclipse.ui.internal.misc.Assert.isNotNull(Assert.java:81)	at org.eclipse.ui.internal.misc.Assert.isNotNull(Assert.java:68)	at org.eclipse.ui.internal.EditorSite.(EditorSite.java:47)	at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:399)	at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:551)	at org.eclipse.ui.internal.WorkbenchPage$6.run(WorkbenchPage.java:1734)	at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:147)	at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:28)	at org.eclipse.swt.widgets.Display.syncExec(Display.java:3389)	at org.eclipse.ui.internal.WorkbenchPage.getEditors(WorkbenchPage.java:1731)	at com.m7.wide.eclipse.Util.activateEditor(Unknown Source)	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:585)	at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:365)	at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:551)	at org.eclipse.ui.internal.EditorReference.getEditor(EditorReference.java:214)	at org.eclipse.ui.internal.EditorManager.findEditor(EditorManager.java:477)	at org.eclipse.ui.internal.EditorManager.findEditor(EditorManager.java:402)	at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2270)	at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2254)	at org.eclipse.ui.internal.WorkbenchPage.access$9(WorkbenchPage.java:2246)	at org.eclipse.ui.internal.WorkbenchPage$9.run(WorkbenchPage.java:2232)	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:69)	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2227)	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2208)	at org.eclipse.ui.ide.IDE.openEditor(IDE.java:753)	at org.eclipse.ui.ide.IDE.openEditor(IDE.java:697)	at com.m7.wide.eclipse.Eclipse3WideEnv.openEditor(Unknown Source)	at com.m7.wide.eclipse.EclipseWideEnv.openEditor(Unknown Source)	at com.m7.wide.project.artifact.action.OpenAction.run(Unknown Source)	at com.m7.wide.eclipse.jstudio.appexplorer.AppExplorerTreeViewer.open(Unknown Source)