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java.lang.NullPointerException: 	at com.datastax.driver.core.Cluster$Manager.close(Cluster.java:1585)	at com.datastax.driver.core.Cluster$Manager.access$200(Cluster.java:1293)	at com.datastax.driver.core.Cluster.closeAsync(Cluster.java:564)	at com.datastax.driver.core.Cluster.close(Cluster.java:576)	at com.datastax.spark.connector.cql.CassandraConnector$.com$datastax$spark$connector$cql$CassandraConnector$$createSession(CassandraConnector.scala:162)	at com.datastax.spark.connector.cql.CassandraConnector$$anonfun$3.apply(CassandraConnector.scala:149)	at com.datastax.spark.connector.cql.CassandraConnector$$anonfun$3.apply(CassandraConnector.scala:149)	at com.datastax.spark.connector.cql.RefCountedCache.createNewValueAndKeys(RefCountedCache.scala:31)	at com.datastax.spark.connector.cql.RefCountedCache.acquire(RefCountedCache.scala:56)	at com.datastax.spark.connector.cql.CassandraConnector.openSession(CassandraConnector.scala:82)	at com.datastax.spark.connector.rdd.CassandraTableScanRDD.compute(CassandraTableScanRDD.scala:326)	at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:323)	at org.apache.spark.rdd.RDD$$anonfun$8.apply(RDD.scala:336)	at org.apache.spark.rdd.RDD$$anonfun$8.apply(RDD.scala:334)	at org.apache.spark.storage.BlockManager$$anonfun$doPutIterator$1.apply(BlockManager.scala:973)	at org.apache.spark.storage.BlockManager$$anonfun$doPutIterator$1.apply(BlockManager.scala:948)	at org.apache.spark.storage.BlockManager.doPut(BlockManager.scala:888)	at org.apache.spark.storage.BlockManager.doPutIterator(BlockManager.scala:948)	at org.apache.spark.storage.BlockManager.getOrElseUpdate(BlockManager.scala:694)	at org.apache.spark.rdd.RDD.getOrCompute(RDD.scala:334)	at org.apache.spark.rdd.RDD.iterator(RDD.scala:285)	at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87)	at org.apache.spark.scheduler.Task.run(Task.scala:99)	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:282)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)