java.lang.IllegalStateException: unread block data

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java.lang.IllegalStateException: unread block data	at java.io.ObjectInputStream$BlockDataInputStream.setBlockDataMode(ObjectInputStream.java:2449)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1385)	at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2018)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1942)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1808)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1353)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:373)	at org.apache.spark.serializer.JavaDeserializationStream.readObject(JavaSerializer.scala:76)	at org.apache.spark.serializer.JavaSerializerInstance.deserialize(JavaSerializer.scala:115)	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:194)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)