Github user keypointt commented on the issue:

    https://github.com/apache/spark/pull/14447
  
    Actually I've already tried to change the classes to be public, and open 
them to not only `[r]` but every module which still does not work.
    
    And exactly, above comment msg is the only error log I have, and no more 
error logs I found...only got to know it failed on `fit()` method...
    
    So the question here actually is, how to find more error logs, like failed 
at which line of which file...


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