Error while running recommendation system in mahout

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Error while running recommendation system in mahout

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I am running recommendation system on a single node hadoop using mahout. It is run on movie data obtained from grouplens (100k data).
hadoop version - 1.1.1

I am executing the following command -

hadoop jar /home/avatar/Desktop/Dissertation/Mahout/mahout-distribution-0.9/mahout-core-0.9-job.jar -s SIMILARITY_COOCCURRENCE --input /user/hduser/mahout/ --output /user/hduser/mahout/output

After a few successful mapreduce tasks, the following error is thrown by each job-
14/02/26 15:10:48 INFO mapred.JobClient: Task Id : attempt_201402261501_0007_m_000000_0, Status : FAILED
Error: org.apache.lucene.util.PriorityQueue.<init>(I)V

What does this error mean, and how to get over with it?
Thanks in advance!