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java.lang.NullPointerException: 	at edu.berkeley.cs.amplab.sparkr.RRDD.compute(RRDD.scala:128)	at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:262)	at org.apache.spark.rdd.RDD.iterator(RDD.scala:229)	at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:62)	at	at org.apache.spark.executor.Executor$	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(	at java.util.concurrent.ThreadPoolExecutor$	at