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java.lang.NullPointerException: 	at edu.berkeley.cs.amplab.sparkr.RRDD.compute(RRDD.scala:117)	at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:241)	at org.apache.spark.rdd.RDD.iterator(RDD.scala:232)	at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:109)	at	at org.apache.spark.executor.Executor$TaskRunner$$anonfun$run$1.apply$mcV$sp(Executor.scala:213)	at org.apache.spark.deploy.SparkHadoopUtil.runAsUser(SparkHadoopUtil.scala:49)	at org.apache.spark.executor.Executor$	at java.util.concurrent.ThreadPoolExecutor.runWorker(	at java.util.concurrent.ThreadPoolExecutor$	at