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com.fasterxml.jackson.module.scala.modifiers.SetTypeModifier$: 	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1183)	at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1377)	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1173)	at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)	at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)	at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)	at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)	at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)	at org.apache.spark.serializer.JavaSerializationStream.writeObject(JavaSerializer.scala:42)	at org.apache.spark.serializer.JavaSerializerInstance.serialize(JavaSerializer.scala:73)	at org.apache.spark.util.ClosureCleaner$.ensureSerializable(ClosureCleaner.scala:164)