java.lang.AssertionError
   at org.clang.tools.services.impl.PreprocessorInitializer.clearStatCache(PreprocessorInitializer.java:130)
   at org.clang.tools.services.ClankPreprocessorServices.invalidate(ClankPreprocessorServices.java:75)
   at org.netbeans.modules.cnd.apt.impl.support.clank.ClankDriverImpl.invalidateImpl(ClankDriverImpl.java:92)
   at org.netbeans.modules.cnd.apt.impl.support.clank.ClankDriverImpl.invalidateImpl(ClankDriverImpl.java:97)
   at org.netbeans.modules.cnd.apt.support.ClankDriver.invalidate(ClankDriver.java:173)
   at org.netbeans.modules.cnd.modelimpl.csm.core.ProjectImpl.onFileEditStart(ProjectImpl.java:164)
   at org.netbeans.modules.cnd.modelimpl.platform.ModelSupport$ModifiedObjectsChangeListener.editStart(ModelSupport.java:630)
   at org.netbeans.modules.cnd.modelimpl.platform.ModelSupport$ModifiedObjectsChangeListener.stateChanged(ModelSupport.java:706)
   at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:133)
   at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:119)
   at org.openide.loaders.DataObject$ModifiedRegistry.add(DataObject.java:1451)
   at org.openide.loaders.DataObject$ModifiedRegistry.add(DataObject.java:1422)
   at java.util.Collections$SynchronizedCollection.add(Collections.java:2035)
   at org.openide.loaders.DataObject.setModified(DataObject.java:558)
   at org.openide.text.DataEditorSupport$Env.markModifiedImpl(DataEditorSupport.java:1002)
   at org.openide.text.DataEditorSupport$Env.access$300(DataEditorSupport.java:768)
   at org.openide.text.DataEditorSupport$Env$1Mark.run(DataEditorSupport.java:965)
   at org.netbeans.modules.progress.ui.RunOffEDTImpl$1.run(RunOffEDTImpl.java:169)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.AssertionError
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:420)
   at org.netbeans.modules.progress.ui.RunOffEDTImpl.runOffEventDispatchThreadImpl(RunOffEDTImpl.java:163)
   at org.netbeans.modules.progress.ui.RunOffEDTImpl.runOffEventDispatchThread(RunOffEDTImpl.java:106)
   at org.netbeans.api.progress.BaseProgressUtils.runOffEventDispatchThread(BaseProgressUtils.java:113)
   at org.netbeans.api.progress.ProgressUtils.runOffEventDispatchThread(ProgressUtils.java:111)
   at org.openide.text.DataEditorSupport$Env.markModified(DataEditorSupport.java:973)
   at org.openide.text.CloneableEditorSupport.notifyModified(CloneableEditorSupport.java:1572)
   at org.netbeans.modules.cnd.source.CppEditorSupport.notifyModified(CppEditorSupport.java:148)
   at org.openide.text.CloneableEditorSupport.callNotifyModified(CloneableEditorSupport.java:1531)
   at org.openide.text.CloneableEditorSupport$DocFilter.checkModificationAllowed(CloneableEditorSupport.java:2423)
   at org.openide.text.CloneableEditorSupport$DocFilter.remove(CloneableEditorSupport.java:2380)
   at org.netbeans.editor.BaseDocument.remove(BaseDocument.java:931)
   at org.netbeans.editor.BaseKit$InsertBreakAction.performLineBreakInsertion(BaseKit.java:1425)
   at org.netbeans.editor.BaseKit$InsertBreakAction.access$200(BaseKit.java:1318)
   at org.netbeans.editor.BaseKit$InsertBreakAction$1.run(BaseKit.java:1353)
   at org.netbeans.editor.GuardedDocument.runAtomicAsUser(GuardedDocument.java:356)
   at org.netbeans.editor.BaseKit$InsertBreakAction.actionPerformed(BaseKit.java:1344)
   at org.netbeans.editor.BaseAction.actionPerformed(BaseAction.java:339)
   at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1663)
   at javax.swing.JComponent.processKeyBinding(JComponent.java:2882)
   at javax.swing.JComponent.processKeyBindings(JComponent.java:2929)
   at javax.swing.JComponent.processKeyEvent(JComponent.java:2845)
   at java.awt.Component.processEvent(Component.java:6302)
   at java.awt.Container.processEvent(Container.java:2234)
   at java.awt.Component.dispatchEventImpl(Component.java:4881)
   at java.awt.Container.dispatchEventImpl(Container.java:2292)
   at java.awt.Component.dispatchEvent(Component.java:4703)
   at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1954)
   at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:806)
   at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:1074)
   at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:945)
   at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:771)
   at java.awt.Component.dispatchEventImpl(Component.java:4752)
   at java.awt.Container.dispatchEventImpl(Container.java:2292)
   at java.awt.Window.dispatchEventImpl(Window.java:2750)
   at java.awt.Component.dispatchEvent(Component.java:4703)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
   at java.awt.EventQueue.access$500(EventQueue.java:97)
   at java.awt.EventQueue$3.run(EventQueue.java:709)
   at java.awt.EventQueue$3.run(EventQueue.java:703)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86)
   at java.awt.EventQueue$4.run(EventQueue.java:731)
   at java.awt.EventQueue$4.run(EventQueue.java:729)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)