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    • java.lang.IllegalArgumentException: Class is not registered: Object[] at com.esotericsoftware.kryo.Kryo.getRegistration( at com.esotericsoftware.kryo.util.DefaultClassResolver.writeClass( at com.esotericsoftware.kryo.Kryo.writeClass( at com.esotericsoftware.kryo.Kryo.writeClassAndObject( at org.apache.spark.serializer.KryoSerializerInstance.serialize(KryoSerializer.scala:296) at org.apache.spark.executor.Executor$ at java.util.concurrent.ThreadPoolExecutor.runWorker( at java.util.concurrent.ThreadPoolExecutor$ at

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