java.lang.AssertionError: Wrong diagnostic handler: com.sun.tools.javac.util.Log$DiscardDiagnosticHandler@24d6c8d1
Thread dump:
Thread-2
	java.lang.Object.wait(Native Method)
	java.lang.Object.wait(Object.java:502)
	java.util.prefs.AbstractPreferences$EventDispatchThread.run(AbstractPreferences.java:1482)
AWT-EventQueue-0
	sun.misc.Unsafe.park(Native Method)
	java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
	java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
	java.awt.EventQueue.getNextEvent(EventQueue.java:547)
	java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:170)
	java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
	java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
	java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
	java.awt.EventDispatchThread.run(Event
   at com.sun.tools.javac.util.Assert.error(Assert.java:133)
   at com.sun.tools.javac.util.Assert.check(Assert.java:86)
   at com.sun.tools.javac.util.Log.popDiagnosticHandler(Log.java:481)
   at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.showDiagnostics(JavacProcessingEnvironment.java:1075)
   at com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1131)
   at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1230)
   at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1117)
   at com.sun.tools.javac.api.JavacTrees.attribStatToTree(JavacTrees.java:889)
   at com.sun.tools.javac.api.JavacTrees.getAttrContext(JavacTrees.java:849)
   at com.sun.tools.javac.api.JavacTrees.getScope(JavacTrees.java:728)
   at com.sun.tools.javac.api.JavacTrees.getScope(JavacTrees.java:124)
   at org.netbeans.modules.java.completion.BaseTask.getEnvImpl(BaseTask.java:313)
   at org.netbeans.modules.java.completion.BaseTask.getCompletionEnvironment(BaseTask.java:265)
   at org.netbeans.modules.java.completion.JavaCompletionTask.resolve(JavaCompletionTask.java:258)
   at org.netbeans.modules.java.completion.BaseTask.run(BaseTask.java:92)
   at org.netbeans.modules.java.completion.JavaCompletionTask.run(JavaCompletionTask.java:80)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:609)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:153)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:137)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:204)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:201)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:141)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:88)
   at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:201)
   at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:104)
   at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.query(JavaCompletionProvider.java:234)
   at org.netbeans.spi.editor.completion.support.AsyncCompletionTask.run(AsyncCompletionTask.java:223)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1425)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2038)
Caused: org.openide.util.RequestProcessor$FastItem: task failed due to: java.lang.AssertionError: Wrong diagnostic handler: com.sun.tools.javac.util.Log$DiscardDiagnosticHandler@24d6c8d1
Thread dump:
Thread-2
	java.lang.Object.wait(Native Method)
	java.lang.Object.wait(Object.java:502)
	java.util.prefs.AbstractPreferences$EventDispatchThread.run(AbstractPreferences.java:1482)
AWT-EventQueue-0
	sun.misc.Unsafe.park(Native Method)
	java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
	java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
	java.awt.EventQueue.getNextEvent(EventQueue.java:547)
	java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:170)
	java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
	java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
	java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	java.awt.EventDispatchThread.pumpEvents(Even