java.lang.IllegalStateException: Annotation not added: null
   at org.netbeans.modules.editor.NbEditorDocument.removeAnnotation(NbEditorDocument.java:252)
   at org.openide.text.NbDocument.removeAnnotation(NbDocument.java:519)
   at org.netbeans.modules.editor.hints.ParseErrorAnnotation.detachAnnotation(ParseErrorAnnotation.java:156)
   at org.netbeans.modules.editor.hints.AnnotationHolder$NbDocumentAttacher.detachAnnotation(AnnotationHolder.java:247)
   at org.netbeans.modules.editor.hints.AnnotationHolder.detachAnnotation(AnnotationHolder.java:226)
   at org.netbeans.modules.editor.hints.AnnotationHolder.updateAnnotationOnLine(AnnotationHolder.java:685)
   at org.netbeans.modules.editor.hints.AnnotationHolder.setErrorDescriptionsImpl(AnnotationHolder.java:977)
   at org.netbeans.modules.editor.hints.AnnotationHolder.access$1400(AnnotationHolder.java:120)
   at org.netbeans.modules.editor.hints.AnnotationHolder$5.run(AnnotationHolder.java:890)
   at org.netbeans.editor.BaseDocument.render(BaseDocument.java:1422)
   at org.netbeans.modules.editor.hints.AnnotationHolder.setErrorDescriptions(AnnotationHolder.java:887)
   at org.netbeans.modules.editor.hints.HintsControllerImpl.setErrorsImpl(HintsControllerImpl.java:111)
   at org.netbeans.modules.editor.hints.HintsControllerImpl.setErrors(HintsControllerImpl.java:101)
   at org.netbeans.spi.editor.hints.HintsController$2.run(HintsController.java:106)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1424)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1968)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.IllegalStateException: Annotation not added: null
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:425)
   at org.netbeans.spi.editor.hints.HintsController.setErrors(HintsController.java:104)
   at org.netbeans.modules.java.hints.jackpot.impl.hints.HintsTask.run(HintsTask.java:113)
   at org.netbeans.modules.java.hints.jackpot.impl.hints.HintsTask.run(HintsTask.java:77)
   at org.netbeans.modules.java.source.JavaSourceAccessor$CancelableTaskWrapper.run(JavaSourceAccessor.java:322)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:615)
   at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:786)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
   at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
   at java.util.concurrent.FutureTask.run(FutureTask.java:138)
   at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
   at java.lang.Thread.run(Thread.java:662)