NullpointerException in ChecksumFileSystem$FSInputChecker.seek

java.lang.NullPointerException
at org.apache.hadoop.fs.ChecksumFileSystem$FSInputChecker.seek(ChecksumFileSystem.java:138)
at org.apache.hadoop.fs.FSDataInputStream$PositionCache.seek(FSDataInputStream.java:47)
at org.apache.hadoop.fs.FSDataInputStream$Buffer.seek(FSDataInputStream.java:82)
at org.apache.hadoop.fs.FSDataInputStream.seek(FSDataInputStream.java:121)
at org.apache.hadoop.streaming.StreamXmlRecordReader.init(StreamXmlRecordReader.java:73)
at org.apache.hadoop.streaming.StreamXmlRecordReader.(StreamXmlRecordReader.java:65)
at com.gale.searchng.workflow.fetcher.FetcherParser$XmlInputFormat.getRecordReader(FetcherParser.java:279)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:139)
at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1445)