bin/hadoop jar org.apache.mahout.cf.taste.hadoop.RecommenderJob org.apache.mahout.cf.taste.impl.recommender.GenericItemBasedRecommender 2 /In/file.0 /In/.file.0.crc Out

I was trying to run reccomender jobs on Hadoop. But had some errors. I will appreciate if you can help on this.
The error is :

09/12/02 19:49:27 INFO mapred.FileInputFormat: Total input paths to process : 1
09/12/02 19:49:30 INFO mapred.JobClient: Running job: job_200912021947_0002
09/12/02 19:49:31 INFO mapred.JobClient: map 0% reduce 0%
09/12/02 19:50:01 INFO mapred.JobClient: Task Id : attempt_200912021947_0002_m_000000_0, Status : FAILED
java.lang.RuntimeException: Error in configuring object
at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:93)
at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:64)
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:354)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
at org.apache.hadoop.mapred.Child.main(Child.java:170)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:88)
… 5 more
Caused by: java.lang.RuntimeException: java.lang.RuntimeException: class org.apache.mahout.cf.taste.hadoop.RecommenderMapper not org.apache.hadoop.mapred.Mapper
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:840)
at org.apache.hadoop.mapred.JobConf.getMapperClass(JobConf.java:771)
at org.apache.hadoop.mapred.MapRunner.configure(MapRunner.java:34)
… 10 more
Caused by: java.lang.RuntimeException: class org.apache.mahout.cf.taste.hadoop.RecommenderMapper not org.apache.hadoop.mapred.Mapper
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:834)
… 12 more

09/12/02 19:50:03 INFO mapred.JobClient: Task Id : attempt_200912021947_0002_m_000001_0, Status : FAILED
java.lang.RuntimeException: Error in configuring object
at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:93)
at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:64)
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:354)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
at org.apache.hadoop.mapred.Child.main(Child.java:170)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:88)
… 5 more
Caused by: java.lang.RuntimeException: java.lang.RuntimeException: class org.apache.mahout.cf.taste.hadoop.RecommenderMapper not org.apache.hadoop.mapred.Mapper
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:840)
at org.apache.hadoop.mapred.JobConf.getMapperClass(JobConf.java:771)
at org.apache.hadoop.mapred.MapRunner.configure(MapRunner.java:34)
… 10 more
Caused by: java.lang.RuntimeException: class org.apache.mahout.cf.taste.hadoop.RecommenderMapper not org.apache.hadoop.mapred.Mapper
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:834)
… 12 more

09/12/02 19:50:10 INFO mapred.JobClient: Task Id : attempt_200912021947_0002_m_000001_1, Status : FAILED
java.lang.RuntimeException: Error in configuring object
at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:93)
at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:64)
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:354)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
at org.apache.hadoop.mapred.Child.main(Child.java:170)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:88)
… 5 more
Caused by: java.lang.RuntimeException: java.lang.RuntimeException: class org.apache.mahout.cf.taste.hadoop.RecommenderMapper not org.apache.hadoop.mapred.Mapper
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:840)
at org.apache.hadoop.mapred.JobConf.getMapperClass(JobConf.java:771)
at org.apache.hadoop.mapred.MapRunner.configure(MapRunner.java:34)
… 10 more
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