java.lang.NullPointerException
   at org.netbeans.modules.python.editor.PythonAstUtils.getNameRange(PythonAstUtils.java:280)
   at org.netbeans.modules.python.editor.PythonOccurrencesMarker.run(PythonOccurrencesMarker.java:239)
   at org.netbeans.modules.python.editor.PythonOccurrencesMarker.run(PythonOccurrencesMarker.java:72)
   at org.netbeans.modules.gsfret.editor.semantic.MarkOccurrencesHighlighter.processImpl(MarkOccurrencesHighlighter.java:176)
   at org.netbeans.modules.gsfret.editor.semantic.MarkOccurrencesHighlighter.run(MarkOccurrencesHighlighter.java:116)
   at org.netbeans.modules.gsfret.editor.semantic.MarkOccurrencesHighlighter.run(MarkOccurrencesHighlighter.java:83)
   at org.netbeans.napi.gsfret.source.Source$CompilationJob.run(Source.java:1420)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
   at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
   at java.util.concurrent.FutureTask.run(FutureTask.java:138)
   at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
   at java.lang.Thread.run(Thread.java:637)