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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