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java.lang.NullPointerException: 	at org.apache.hadoop.mapreduce.lib.input.FileInputFormat.getBlockIndex(FileInputFormat.java:444)	at org.apache.hadoop.mapreduce.lib.input.FileInputFormat.getSplits(FileInputFormat.java:413)	at org.apache.hadoop.mapreduce.JobSubmitter.writeNewSplits(JobSubmitter.java:301)	at org.apache.hadoop.mapreduce.JobSubmitter.writeSplits(JobSubmitter.java:318)	at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:196)	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 undefined.Main.main(Main.java:79)