java.lang.AssertionError: Open task already inited.
   at org.openide.text.DocumentOpenClose.initLoadTaskLA(DocumentOpenClose.java:413)
   at org.openide.text.DocumentOpenClose.openTask(DocumentOpenClose.java:287)
   at org.openide.text.CloneableEditorSupport.prepareDocument(CloneableEditorSupport.java:510)
   at org.netbeans.modules.cnd.source.CppEditorSupport.access$001(CppEditorSupport.java:103)
   at org.netbeans.modules.cnd.source.CppEditorSupport$2.run(CppEditorSupport.java:362)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1432)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2042)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.AssertionError: Open task already inited.
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:424)
   at org.netbeans.modules.cnd.source.CppEditorSupport.prepareDocument(CppEditorSupport.java:359)
   at org.openide.text.CloneableEditorSupport.createCloneableTopComponent(CloneableEditorSupport.java:1019)
   at org.openide.windows.CloneableOpenSupport.openCloneableTopComponent(CloneableOpenSupport.java:205)
   at org.openide.windows.CloneableOpenSupport$1.run(CloneableOpenSupport.java:106)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
   at java.awt.EventQueue.access$200(EventQueue.java:103)
   at java.awt.EventQueue$3.run(EventQueue.java:694)
   at java.awt.EventQueue$3.run(EventQueue.java:692)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)