java.lang.AssertionError
   at org.openide.text.CloneableEditor$DoInitialize.initNonVisual(CloneableEditor.java:628)
   at org.openide.text.CloneableEditor$DoInitialize.run(CloneableEditor.java:367)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1411)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1991)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.AssertionError
   at org.openide.util.RequestProcessor$Task.schedule(RequestProcessor.java:1452)
   at org.openide.text.CloneableEditor$DoInitialize.<init>(CloneableEditor.java:332)
   at org.openide.text.CloneableEditor.initialize(CloneableEditor.java:248)
   at org.openide.text.CloneableEditor.componentShowing(CloneableEditor.java:223)
   at org.netbeans.core.spi.multiview.text.MultiViewCloneableEditor.componentShowing(MultiViewCloneableEditor.java:143)
   at org.netbeans.core.spi.multiview.text.MultiViewEditorElement.componentShowing(MultiViewEditorElement.java:134)
   at org.netbeans.core.multiview.MultiViewPeer.peerComponentShowing(MultiViewPeer.java:259)
   at org.netbeans.core.multiview.MultiViewCloneableTopComponent.componentShowing(MultiViewCloneableTopComponent.java:125)
   at org.openide.windows.WindowManager.componentShowing(WindowManager.java:339)
   at org.netbeans.core.windows.WindowManagerImpl.componentShowing(WindowManagerImpl.java:1157)
   at org.netbeans.core.windows.view.DefaultView.changeGUI(DefaultView.java:168)
   at org.netbeans.core.windows.ViewRequestor.dispatchRequest(ViewRequestor.java:273)
   at org.netbeans.core.windows.ViewRequestor.processRequest(ViewRequestor.java:249)
   at org.netbeans.core.windows.ViewRequestor.postRequest(ViewRequestor.java:187)
   at org.netbeans.core.windows.ViewRequestor.scheduleRequest(ViewRequestor.java:127)
   at org.netbeans.core.windows.Central.activateModeTopComponent(Central.java:1760)
   at org.netbeans.core.windows.WindowManagerImpl.topComponentRequestActive(WindowManagerImpl.java:1291)
   at org.openide.windows.TopComponent.requestActive(TopComponent.java:868)
   at org.openide.windows.CloneableOpenSupport$1.run(CloneableOpenSupport.java:102)
   at org.openide.util.Mutex.doEvent(Mutex.java:1341)
   at org.openide.util.Mutex.writeAccess(Mutex.java:455)
   at org.openide.windows.CloneableOpenSupport.open(CloneableOpenSupport.java:98)
   at org.openide.text.CloneableEditorSupport.open(CloneableEditorSupport.java:502)
   at org.netbeans.modules.cnd.modelutil.CsmUtilities$3.run(CsmUtilities.java:795)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:153)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)