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java.lang.NullPointerException: 	at java.lang.ProcessBuilder.start(Unknown Source)	at org.apache.hadoop.util.Shell.runCommand(Shell.java:445)	at org.apache.hadoop.util.Shell.run(Shell.java:418)	at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:650)	at org.apache.hadoop.util.Shell.execCommand(Shell.java:739)	at org.apache.hadoop.util.Shell.execCommand(Shell.java:722)	at org.apache.hadoop.fs.RawLocalFileSystem.setPermission(RawLocalFileSystem.java:633)	at org.apache.hadoop.fs.FilterFileSystem.setPermission(FilterFileSystem.java:467)	at org.apache.hadoop.fs.ChecksumFileSystem.create(ChecksumFileSystem.java:456)	at org.apache.hadoop.fs.ChecksumFileSystem.create(ChecksumFileSystem.java:424)	at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:906)	at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:887)	at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:849)	at org.apache.hadoop.fs.FileSystem.createNewFile(FileSystem.java:1149)	at org.apache.nutch.util.LockUtil.createLockFile(LockUtil.java:58)	at org.apache.nutch.crawl.Injector.inject(Injector.java:357)	at org.apache.nutch.crawl.Injector.run(Injector.java:467)	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)	at org.apache.nutch.crawl.Injector.main(Injector.java:441)