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java.lang.NullPointerException: 	at	at org.apache.hadoop.hdfs.DFSClient.getDelegationToken(	at org.apache.hadoop.hdfs.DistributedFileSystem.getDelegationToken(	at$2.getToken(	at$	at$	at Method)	at	at	at	at azkaban.jobtype.HadoopPigJob.getHadoopTokens(	at	at azkaban.execapp.JobRunner.runJob(	at	at java.util.concurrent.Executors$	at java.util.concurrent.FutureTask$Sync.innerRun(	at	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(	at java.util.concurrent.ThreadPoolExecutor$	at