java.lang.NullPointerException
   at org.netbeans.modules.editor.lib2.view.ViewChildren.startVisualOffset(ViewChildren.java:199)
   at org.netbeans.modules.editor.lib2.view.DocumentViewChildren.getChildAllocation(DocumentViewChildren.java:222)
   at org.netbeans.modules.editor.lib2.view.DocumentView.getChildAllocation(DocumentView.java:315)
   at org.netbeans.modules.editor.lib2.view.ViewHierarchyImpl.modelToParagraphView(ViewHierarchyImpl.java:286)
   at org.netbeans.modules.editor.lib2.view.LockedViewHierarchy.modelToParagraphView(LockedViewHierarchy.java:124)
   at org.netbeans.editor.GlyphGutter$6.run(GlyphGutter.java:655)
   at org.netbeans.editor.BaseDocument.render(BaseDocument.java:1404)
   at org.netbeans.editor.GlyphGutter.changedLine(GlyphGutter.java:644)
   at org.netbeans.editor.Annotations.fireChangedLine(Annotations.java:644)
   at org.netbeans.editor.Annotations.refreshLine(Annotations.java:564)
   at org.netbeans.editor.Annotations.removeAnnotation(Annotations.java:357)
   at org.netbeans.modules.editor.NbEditorDocument.removeAnnotation(NbEditorDocument.java:256)
   at org.openide.text.NbDocument.removeAnnotation(NbDocument.java:519)
   at org.netbeans.modules.editor.hints.ParseErrorAnnotation.detachAnnotation(ParseErrorAnnotation.java:156)
   at org.netbeans.modules.editor.hints.AnnotationHolder$NbDocumentAttacher.detachAnnotation(AnnotationHolder.java:247)
   at org.netbeans.modules.editor.hints.AnnotationHolder.detachAnnotation(AnnotationHolder.java:226)
   at org.netbeans.modules.editor.hints.AnnotationHolder.updateAnnotationOnLine(AnnotationHolder.java:689)
   at org.netbeans.modules.editor.hints.AnnotationHolder.setErrorDescriptionsImpl(AnnotationHolder.java:981)
   at org.netbeans.modules.editor.hints.AnnotationHolder.access$1400(AnnotationHolder.java:120)
   at org.netbeans.modules.editor.hints.AnnotationHolder$5.run(AnnotationHolder.java:894)
   at org.netbeans.editor.BaseDocument.render(BaseDocument.java:1404)
   at org.netbeans.modules.editor.hints.AnnotationHolder.setErrorDescriptions(AnnotationHolder.java:891)
   at org.netbeans.modules.editor.hints.HintsControllerImpl.setErrorsImpl(HintsControllerImpl.java:111)
   at org.netbeans.modules.editor.hints.HintsControllerImpl.setErrors(HintsControllerImpl.java:93)
   at org.netbeans.spi.editor.hints.HintsController$1.run(HintsController.java:84)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1424)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1973)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NullPointerException
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:425)
   at org.netbeans.spi.editor.hints.HintsController.setErrors(HintsController.java:82)
   at org.netbeans.modules.java.editor.semantic.SemanticHighlighter$3.setErrors(SemanticHighlighter.java:1565)
   at org.netbeans.modules.java.editor.semantic.SemanticHighlighter.process(SemanticHighlighter.java:390)
   at org.netbeans.modules.java.editor.semantic.SemanticHighlighter.process(SemanticHighlighter.java:271)
   at org.netbeans.modules.java.editor.semantic.SemanticHighlighter.run(SemanticHighlighter.java:209)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:624)
   at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:801)
   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)