java.lang.NullPointerException: This exception has no message.

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This exception has no message.
at org.apache.spark.SparkContext.unpersistRDD(SparkContext.scala:1623)
at org.apache.spark.streaming.dstream.DStream$$anonfun$clearMetadata$3.apply(DStream.scala:469)
at scala.collection.mutable.HashMap$$anon$2$$anonfun$foreach$3.apply(HashMap.scala:107)
at scala.collection.mutable.HashMap$$anon$2$$anonfun$foreach$3.apply(HashMap.scala:107)
at scala.collection.mutable.HashTable$class.foreachEntry(HashTable.scala:226)
at scala.collection.mutable.HashMap.foreachEntry(HashMap.scala:39)
at org.apache.spark.streaming.dstream.DStream.clearMetadata(DStream.scala:468)
at org.apache.spark.streaming.dstream.DStream$$anonfun$clearMetadata$5.apply(DStream.scala:481)

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