Github user yanboliang commented on the issue: https://github.com/apache/spark/pull/14447 Actually I don't have an excellent debug way for SparkR wrappers. Usually you can create a ```RWrapperSuite``` and test whether it works well in the Scala side (If you encounter some issues about private class, change it to public temporary for test). For your above issue, please provide more error logs, then I can help you to find some clue for the error.
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