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org.eclipse.core.runtime.AssertionFailedException: null argument:	at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:85)	at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:73)	at org.eclipse.jface.viewers.StructuredViewer.assertElementsNotNull(StructuredViewer.java:597)	at org.eclipse.jface.viewers.StructuredViewer.getRawChildren(StructuredViewer.java:993)	at org.eclipse.jface.viewers.ColumnViewer.getRawChildren(ColumnViewer.java:699)	at org.eclipse.jface.viewers.AbstractTableViewer.getRawChildren(AbstractTableViewer.java:1095)	at org.eclipse.jface.viewers.StructuredViewer.getFilteredChildren(StructuredViewer.java:900)	at org.eclipse.jface.viewers.StructuredViewer.getSortedChildren(StructuredViewer.java:1049)	at org.eclipse.jface.viewers.AbstractTableViewer.internalRefreshAll(AbstractTableViewer.java:701)	at org.eclipse.jface.viewers.AbstractTableViewer.internalRefresh(AbstractTableViewer.java:649)	at org.eclipse.jface.viewers.AbstractTableViewer.internalRefresh(AbstractTableViewer.java:636)	at org.eclipse.jface.viewers.AbstractTableViewer$1.run(AbstractTableViewer.java:592)	at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1427)	at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1388)	at org.eclipse.jface.viewers.CheckboxTableViewer.preservingSelection(CheckboxTableViewer.java:349)	at org.eclipse.jface.viewers.AbstractTableViewer.inputChanged(AbstractTableViewer.java:590)	at org.eclipse.jface.viewers.ContentViewer.setInput(ContentViewer.java:280)	at org.eclipse.jface.viewers.StructuredViewer.setInput(StructuredViewer.java:1674)	at test.app.internal.widget.dialog.ClientMultiSelectionDialog.createContent(ClientMultiSelectionDialog.java:59)	at test.app.internal.widget.tab.SaveDialog.createContent(SaveDialog.java:109)	at test.app.internal.widget.tab.SaveDialog.createDialogArea(SaveDialog.java:60)	at org.eclipse.jface.dialogs.Dialog.createContents(Dialog.java:745)	at org.eclipse.jface.window.Window.create(Window.java:444)	at org.eclipse.jface.dialogs.Dialog.create(Dialog.java:1071)	at org.eclipse.jface.window.Window.open(Window.java:822)	at test.app.internal.AppTester.testSaveDialog(AppTester.java:136)	at test.app.internal.AppTester.testDialog(AppTester.java:99)	at test.app.internal.EntryPoint$12$1.widgetSelected(EntryPoint.java:611)	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:262)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:86)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:700)	at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:602)	at org.eclipse.swt.widgets.Display.executeNextEvent(Display.java:1212)	at org.eclipse.swt.widgets.Display.runPendingMessages(Display.java:1193)	at org.eclipse.swt.widgets.Display.safeReadAndDispatch(Display.java:1176)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:1168)	at org.eclipse.rap.rwt.application.AbstractEntryPoint.createUI(AbstractEntryPoint.java:62)	at org.eclipse.rap.rwt.internal.lifecycle.RWTLifeCycle.createUI(RWTLifeCycle.java:172)	at org.eclipse.rap.rwt.internal.lifecycle.RWTLifeCycle$UIThreadController.run(RWTLifeCycle.java:284)	at java.lang.Thread.run(Thread.java:745)	at org.eclipse.rap.rwt.internal.lifecycle.UIThread.run(UIThread.java:105)