java.lang.NullPointerException
   at com.sun.tools.javac.model.JavacElements.addMembers(JavacElements.java:411)
   at com.sun.tools.javac.model.JavacElements.getAllMembers(JavacElements.java:405)
   at com.sun.tools.javac.model.JavacElements.getAllMembers(JavacElements.java:61)
   at org.netbeans.modules.java.navigation.ElementScanningTask.addMembers(ElementScanningTask.java:222)
   at org.netbeans.modules.java.navigation.ElementScanningTask.addMembers(ElementScanningTask.java:233)
   at org.netbeans.modules.java.navigation.ElementScanningTask.runImpl(ElementScanningTask.java:146)
   at org.netbeans.modules.java.navigation.ElementScanningTask.run(ElementScanningTask.java:104)
   at org.netbeans.modules.java.navigation.ElementScanningTask.run(ElementScanningTask.java:85)
   at org.netbeans.modules.java.source.JavaSourceAccessor$CancelableTaskWrapper.run(JavaSourceAccessor.java:298)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:568)
   at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:744)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
   at java.util.concurrent.FutureTask.run(FutureTask.java:262)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)