py4j.Py4JException: Cannot obtain a new communication channel

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py4j.Py4JException: Cannot obtain a new communication channel
at py4j.CallbackClient.sendCommand(CallbackClient.java:251)
at py4j.CallbackClient.sendCommand(CallbackClient.java:259)
at py4j.CallbackClient.sendCommand(CallbackClient.java:228)
at py4j.reflection.PythonProxyHandler.invoke(PythonProxyHandler.java:107)
at com.sun.proxy.$Proxy17.processInput2(Unknown Source)

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