java.lang.AssertionError: Wrong diagnostic handler: com.sun.tools.javac.util.Log$DeferredDiagnosticHandler@3f7666e7
Thread dump:
Java2D Disposer
	java.lang.Object.wait(Native Method)
	java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:142)
	java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:158)
	sun.java2d.Disposer.run(Disposer.java:148)
	java.lang.Thread.run(Thread.java:745)
TimerQueue
	sun.misc.Unsafe.park(Native Method)
	java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
	java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
	java.util.concurrent.DelayQueue.take(DelayQueue.java:223)
	javax.swing.TimerQueue.run(TimerQueue.java:171)
	java.lang.Thread.run(Thread.java:745)
Deadlock Detector
	java.lang.Thread.sleep(Native Method)
	org.netbeans.modules.deadlock.detector.Detector.run(Detector.java:138)
	java.lang.Thread.run(Thread.java:745)
Framework Active Thread
	java.lang.Object.wait(Native Method)
	org.eclipse.osgi
   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:484)
   at com.sun.tools.javac.api.JavacTrees.attribStatToTree(JavacTrees.java:888)
   at com.sun.tools.javac.api.JavacTrees.getAttrContext(JavacTrees.java:847)
   at com.sun.tools.javac.api.JavacTrees.getScope(JavacTrees.java:726)
   at com.sun.tools.javac.api.JavacTrees.getScope(JavacTrees.java:124)
   at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.getEnvImpl(JavaCompletionProvider.java:5619)
   at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.getCompletionEnvironment(JavaCompletionProvider.java:5574)
   at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.resolveCompletion(JavaCompletionProvider.java:640)
   at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.run(JavaCompletionProvider.java:448)
   at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery$Task.run(JavaCompletionProvider.java:5908)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:598)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:155)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:139)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:206)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:203)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:74)
   at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:203)
   at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:106)
   at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.query(JavaCompletionProvider.java:320)
   at org.netbeans.spi.editor.completion.support.AsyncCompletionTask.run(AsyncCompletionTask.java:223)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)
Caused: org.openide.util.RequestProcessor$FastItem: task failed due to: java.lang.AssertionError: Wrong diagnostic handler: com.sun.tools.javac.util.Log$DeferredDiagnosticHandler@3f7666e7
Thread dump:
Java2D Disposer
	java.lang.Object.wait(Native Method)
	java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:142)
	java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:158)
	sun.java2d.Disposer.run(Disposer.java:148)
	java.lang.Thread.run(Thread.java:745)
TimerQueue
	sun.misc.Unsafe.park(Native Method)
	java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
	java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
	java.util.concurrent.DelayQueue.take(DelayQueue.java:223)
	javax.swing.TimerQueue.run(TimerQueue.java:171)
	java.lang.Thread.run(Thread.java:745)
Deadlock Detector
	java.lang.Thread.sleep(Native Method)
	org.netbeans.modules.deadlock.detector.Detector.run(Detector.java:138)
	java.lang.Thread.run(Thread.java:745)
Framework Activ