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java.lang.NullPointerException: 	at java.util.ComparableTimSort.sort(ComparableTimSort.java:146)	at java.util.Arrays.sort(Arrays.java:472)	at org.apache.hadoop.mapred.SequenceFileOutputFormat.getReaders(SequenceFileOutputFormat.java:85)	at org.apache.nutch.segment.SegmentReader.getStats(SegmentReader.java:463)	at org.apache.nutch.segment.SegmentReader.list(SegmentReader.java:441)	at org.apache.nutch.segment.SegmentReader.main(SegmentReader.java:587)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.apache.hadoop.util.RunJar.main(RunJar.java:160)