java.lang.AssertionError
        at org.netbeans.modules.python.editor.PythonDeclarationFinder.findMethodDeclaration(PythonDeclarationFinder.java:862)
        at org.netbeans.modules.python.editor.PythonCodeCompleter.computeMethodCall(PythonCodeCompleter.java:1603)
        at org.netbeans.modules.python.editor.PythonCodeCompleter.completeParameters(PythonCodeCompleter.java:1428)
        at org.netbeans.modules.python.editor.PythonCodeCompleter.complete(PythonCodeCompleter.java:306)
        at org.netbeans.modules.gsfret.editor.completion.GsfCompletionProvider$JavaCompletionQuery.addCodeCompletionItems(GsfCompletionProvider.java:589)
        at org.netbeans.modules.gsfret.editor.completion.GsfCompletionProvider$JavaCompletionQuery.resolveCompletion(GsfCompletionProvider.java:575)
        at org.netbeans.modules.gsfret.editor.completion.GsfCompletionProvider$JavaCompletionQuery.run(GsfCompletionProvider.java:405)
        at org.netbeans.modules.gsfret.editor.completion.GsfCompletionProvider$JavaCompletionQuery.run(GsfCompletionProvider.java:233)
        at org.netbeans.napi.gsfret.source.Source.runUserActionTask(Source.java:493)
        at org.netbeans.modules.gsfret.editor.completion.GsfCompletionProvider$JavaCompletionQuery.query(GsfCompletionProvider.java:307)
        at org.netbeans.spi.editor.completion.support.AsyncCompletionTask.run(AsyncCompletionTask.java:218)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:573)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1005)