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.cnd.navigation.overrides.BaseAnnotation.detachImpl(BaseAnnotation.java:220)
   at org.netbeans.modules.cnd.navigation.overrides.AnnotationsHolder.run(AnnotationsHolder.java:160)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1424)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1968)