java.lang.IllegalStateException: Annotation not added: org-netbeans-spi-editor-hints-parser_annotation_verifierVariable $mv_um02 seems to be unused in its scope
----
(Alt-Enter shows hints)
   at org.netbeans.modules.editor.NbEditorDocument.removeAnnotation(NbEditorDocument.java:256)
   at org.openide.text.NbDocument.removeAnnotation(NbDocument.java:519)
   at org.netbeans.modules.editor.hints.ParseErrorAnnotation.detachAnnotation(ParseErrorAnnotation.java:156)
   at org.netbeans.modules.editor.hints.AnnotationHolder$NbDocumentAttacher.detachAnnotation(AnnotationHolder.java:300)
   at org.netbeans.modules.editor.hints.AnnotationHolder.detachAnnotation(AnnotationHolder.java:279)
   at org.netbeans.modules.editor.hints.AnnotationHolder.updateAnnotationOnLine(AnnotationHolder.java:706)
   at org.netbeans.modules.editor.hints.AnnotationHolder.setErrorDescriptionsImpl(AnnotationHolder.java:1047)
   at org.netbeans.modules.editor.hints.AnnotationHolder.access$1400(AnnotationHolder.java:121)
   at org.netbeans.modules.editor.hints.AnnotationHolder$6.run(AnnotationHolder.java:960)
   at org.netbeans.editor.BaseDocument.render(BaseDocument.java:1336)
   at org.netbeans.modules.editor.hints.AnnotationHolder.setErrorDescriptions(AnnotationHolder.java:957)
   at org.netbeans.modules.editor.hints.HintsControllerImpl.setErrorsImpl(HintsControllerImpl.java:115)
   at org.netbeans.modules.editor.hints.HintsControllerImpl.setErrors(HintsControllerImpl.java:105)
   at org.netbeans.spi.editor.hints.HintsController$2.run(HintsController.java:106)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1411)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1991)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.IllegalStateException: Annotation not added: org-netbeans-spi-editor-hints-parser_annotation_verifierVariable $mv_um02 seems to be unused in its scope
----
(Alt-Enter shows hints)
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:428)
   at org.netbeans.spi.editor.hints.HintsController.setErrors(HintsController.java:104)
   at org.netbeans.modules.csl.hints.infrastructure.HintsTask.run(HintsTask.java:143)
   at org.netbeans.modules.csl.hints.infrastructure.HintsTask.run(HintsTask.java:74)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:618)
   at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:795)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
   at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
   at java.util.concurrent.FutureTask.run(FutureTask.java:166)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
   at java.lang.Thread.run(Thread.java:722)