java.lang.NullPointerException
        at org.netbeans.modules.python.project.ui.actions.RunCommand.invokeAction(RunCommand.java:40)
        at org.netbeans.modules.python.project.PythonActionProvider$1.run(PythonActionProvider.java:70)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:572)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:997)