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java.lang.NullPointerException at java.lang.ProcessBuilder.start(ProcessBuilder.java:1010) at org.apache.hadoop.util.Shell.runCommand(Shell.java:483) at org.apache.hadoop.util.Shell.run(Shell.java:456) at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:722) at org.apache.hadoop.util.Shell.execCommand(Shell.java:815) at org.apache.hadoop.util.Shell.execCommand(Shell.java:798) at org.apache.hadoop.fs.RawLocalFileSystem.setPermission(RawLocalFileSystem.java:731) at org.apache.hadoop.fs.RawLocalFileSystem.mkOneDirWithMode(RawLocalFileSystem.java:489) at org.apache.hadoop.fs.RawLocalFileSystem.mkdirsWithOptionalPermission(RawLocalFileSystem.java:530) at org.apache.hadoop.fs.RawLocalFileSystem.mkdirs(RawLocalFileSystem.java:507) at org.apache.hadoop.fs.FilterFileSystem.mkdirs(FilterFileSystem.java:305) at org.apache.hadoop.mapreduce.JobSubmissionFiles.getStagingDir(JobSubmissionFiles.java:133) at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:144) at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1290) at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1287) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:415) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657) at org.apache.hadoop.mapreduce.Job.submit(Job.java:1287) at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1308) at MapReduce.HadMapReduce.RecCount.run(RecCount.java:22) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84) at MapReduce.HadMapReduce.RecCount.main(RecCount.java:26)