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java.lang.NullPointerException: 	at java.lang.ProcessBuilder.start(Unknown Source)	at org.apache.hadoop.util.Shell.runCommand(Shell.java:482)	at org.apache.hadoop.util.Shell.run(Shell.java:455)	at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:715)	at org.apache.hadoop.util.Shell.execCommand(Shell.java:808)	at org.apache.hadoop.util.Shell.execCommand(Shell.java:791)	at org.apache.hadoop.fs.RawLocalFileSystem.setPermission(RawLocalFileSystem.java:656)	at org.apache.hadoop.fs.FilterFileSystem.setPermission(FilterFileSystem.java:490)	at org.apache.hadoop.fs.ChecksumFileSystem.create(ChecksumFileSystem.java:462)	at org.apache.hadoop.fs.ChecksumFileSystem.create(ChecksumFileSystem.java:428)	at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:908)	at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:889)	at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:786)	at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:775)	at com.databricks.spark.avro.AvroOutputWriter$$anon$1.getAvroFileOutputStream(AvroOutputWriter.scala:79)	at org.apache.avro.mapreduce.AvroKeyOutputFormat.getRecordWriter(AvroKeyOutputFormat.java:105)	at com.databricks.spark.avro.AvroOutputWriter.(AvroOutputWriter.scala:82)	at com.databricks.spark.avro.AvroOutputWriterFactory.newInstance(AvroOutputWriterFactory.scala:31)	at org.apache.spark.sql.execution.datasources.BaseWriterContainer.newOutputWriter(WriterContainer.scala:129)	at org.apache.spark.sql.execution.datasources.DefaultWriterContainer.writeRows(WriterContainer.scala:255)	at org.apache.spark.sql.execution.datasources.InsertIntoHadoopFsRelation$$anonfun$run$1$$anonfun$apply$mcV$sp$3.apply(InsertIntoHadoopFsRelation.scala:150)	at org.apache.spark.sql.execution.datasources.InsertIntoHadoopFsRelation$$anonfun$run$1$$anonfun$apply$mcV$sp$3.apply(InsertIntoHadoopFsRelation.scala:150)	at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:66)	at org.apache.spark.scheduler.Task.run(Task.scala:89)	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:214)	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)