java.lang.NullPointerException
   at org.netbeans.modules.editor.fold.support.FoldMaintainerImpl.updateFoldsImpl(FoldMaintainerImpl.java:169)
   at org.netbeans.modules.editor.fold.support.FoldMaintainerImpl.access$000(FoldMaintainerImpl.java:78)
   at org.netbeans.modules.editor.fold.support.FoldMaintainerImpl$1.run(FoldMaintainerImpl.java:150)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1454)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2036)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NullPointerException
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:435)
   at org.netbeans.modules.editor.fold.support.FoldMaintainerImpl.scheduleUpdate(FoldMaintainerImpl.java:148)
   at org.netbeans.modules.editor.fold.support.FoldMaintainerImpl.updateFolds(FoldMaintainerImpl.java:156)
   at org.netbeans.modules.editor.fold.spi.support.FoldInfoHolder.setFolds(FoldInfoHolder.java:81)
   at org.netbeans.modules.java.editor.ext.fold.ShorteningFold.run(ShorteningFold.java:112)
   at org.netbeans.modules.java.editor.ext.fold.ShorteningFold.run(ShorteningFold.java:97)
   at org.netbeans.modules.java.source.JavaSourceAccessor$CancelableTaskWrapper.run(JavaSourceAccessor.java:298)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:558)
   at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:734)
   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)