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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)