org.apache.spark.SparkException: Task not serializable

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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$$clean(ClosureCleaner.scala:288)
at org.apache.spark.util.ClosureCleaner$.clean(ClosureCleaner.scala:108)
at org.apache.spark.SparkContext.clean(SparkContext.scala:2039)
at org.apache.spark.rdd.RDD$$anonfun$map$1.apply(RDD.scala:366)
at org.apache.spark.rdd.RDD$$anonfun$map$1.apply(RDD.scala:365)
at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151)
at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:112)
at org.apache.spark.rdd.RDD.withScope(RDD.scala:358)
at org.apache.spark.rdd.RDD.map(RDD.scala:365)
at org.apache.spark.api.java.JavaRDDLike$class.map(JavaRDDLike.scala:92)
at topicmodeling.TopicModelingTest.testTFIDF(TopicModelingTest.java:188)

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