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java.lang.NullPointerException: 	at java.lang.ProcessBuilder.start(ProcessBuilder.java:1012)	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$ShellCommandExecutor.execute(Shell.java:722)	at org.apache.hadoop.util.Shell.execCommand(Shell.java:815)	at org.apache.hadoop.util.Shell.execCommand(Shell.java:798)	at org.apache.hadoop.fs.RawLocalFileSystem.setPermission(RawLocalFileSystem.java:728)	at org.apache.hadoop.fs.RawLocalFileSystem$LocalFSFileOutputStream.(RawLocalFileSystem.java:225)	at org.apache.hadoop.fs.RawLocalFileSystem$LocalFSFileOutputStream.(RawLocalFileSystem.java:209)	at org.apache.hadoop.fs.RawLocalFileSystem.createOutputStreamWithMode(RawLocalFileSystem.java:305)	at org.apache.hadoop.fs.RawLocalFileSystem.create(RawLocalFileSystem.java:294)	at org.apache.hadoop.fs.RawLocalFileSystem.create(RawLocalFileSystem.java:326)	at org.apache.hadoop.fs.ChecksumFileSystem$ChecksumFSOutputSummer.(ChecksumFileSystem.java:393)	at org.apache.hadoop.fs.ChecksumFileSystem.create(ChecksumFileSystem.java:456)	at org.apache.hadoop.fs.ChecksumFileSystem.create(ChecksumFileSystem.java:435)	at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:909)	at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:802)	at hadoop.copyToHDFS.main(copyToHDFS.java:35)	at hadoop.Launcher$1.run(Launcher.java:63)	at java.lang.Thread.run(Thread.java:745)