py4j.Py4JException: Method __getstate__([]) does not exist

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    Root Cause Analysis

    1. py4j.Py4JException

      Method __getstate__([]) does not exist

      at py4j.reflection.ReflectionEngine.getMethod()
    2. Py4J
      GatewayConnection.run
      1. py4j.reflection.ReflectionEngine.getMethod(ReflectionEngine.java:335)
      2. py4j.reflection.ReflectionEngine.getMethod(ReflectionEngine.java:344)
      3. py4j.Gateway.invoke(Gateway.java:252)
      4. py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:133)
      5. py4j.commands.CallCommand.execute(CallCommand.java:79)
      6. py4j.GatewayConnection.run(GatewayConnection.java:209)
      6 frames
    3. Java RT
      Thread.run
      1. java.lang.Thread.run(Thread.java:745)
      1 frame