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org.apache.spark.SparkException: Task not serializable	at org.apache.spark.util.ClosureCleaner$.ensureSerializable(ClosureCleaner.scala:298)	at org.apache.spark.util.ClosureCleaner$.org$apache$spark$util$ClosureCleaner$$clean(ClosureCleaner.scala:288)	at org.apache.spark.util.ClosureCleaner$.clean(ClosureCleaner.scala:108)	at org.apache.spark.SparkContext.clean(SparkContext.scala:2037)	at org.apache.spark.rdd.RDD$$anonfun$foreach$1.apply(RDD.scala:874)	at org.apache.spark.rdd.RDD$$anonfun$foreach$1.apply(RDD.scala:873)