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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 org.apache.spark.api.java.AbstractJavaRDDLike.map(JavaRDDLike.scala:45)	at topicmodeling.TopicModelingTest.testTFIDF(TopicModelingTest.java:188)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)