I was trying to run the example program in Hadoop given here

when i try the run it I get a org.apache.hadoop.mapred.FileAlreadyExistsException

emil@psycho-O:~/project/hadoop-0.20.2$ bin/hadoop jar jar_files/wordcount.jar org.myorg.WordCount jar_files/wordcount/input jar_files/wordcount/output
11/02/06 14:54:23 INFO jvm.JvmMetrics: Initializing JVM Metrics with processName=JobTracker, sessionId=
11/02/06 14:54:23 WARN mapred.JobClient: Use GenericOptionsParser for parsing the arguments. Applications should implement Tool for the same.
Exception in thread "main" org.apache.hadoop.mapred.FileAlreadyExistsException: Output directory file:/home/emil/project/hadoop-0.20.2/jar_files/wordcount/input already exists
    at org.apache.hadoop.mapred.FileOutputFormat.checkOutputSpecs(FileOutputFormat.java:111)
    at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:772)
    at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:730)
    at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:1249)
    at org.myorg.WordCount.main(WordCount.java:55)
    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.RunJar.main(RunJar.java:156)
emil@psycho-O:~/project/hadoop-0.20.2$

Its from /home/emil/project/hadoop-0.20.2/jar_files/wordcount/input that I take my input files file01 and file02. When i googled i found out that this is done to prevent re-execution of same task. But in my case its the input file that is causing the exception. Is there anything wrong with my command because I don't see any posts with the same erro

java hadoop
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