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getting UnknownHostException
Hi Friends ,
i am getting UnknownHostException while executing Hadoop Word count program

getting below details from job tracker Web page

*User:* sujit
*Job Name:* word count
*Job File:*
hdfs://localhost:54310/app/hadoop/tmp/mapred/staging/sujit/.staging/job_201204112234_0002/job.xml<http://localhost:50030/jobconf.jsp?jobid=job_201204112234_0002>
*Submit Host:* sujit.(null)
*Submit Host Address:* 127.0.1.1
*Job-ACLs: All users are allowed*
*Job Setup:*None
*Status:* Failed
*Failure Info:*Job initialization failed: java.net.UnknownHostException:
sujit.(null) is not a valid Inet address at org.apache.hadoop.net.
NetUtils.verifyHostnames(NetUtils.java:569) at
org.apache.hadoop.mapred.JobInProgress.initTasks(JobInProgress.java:711) at
org.apache.hadoop.mapred.JobTracker.initJob(JobTracker.java:4207) at
org.apache.hadoop.mapred.EagerTaskInitializationListener$InitJob.run(EagerTaskInitializationListener.java:79)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
*Started at:* Wed Apr 11 22:36:46 IST 2012
*Failed at:* Wed Apr 11 22:36:47 IST 2012
*Failed in:* 0sec
*Job Cleanup:*None
Can some one help me how to resolve this issue .
i tried with : http://wiki.apache.org/hadoop/UnknownHost

but still not able to resolve issue ,
please help me out .
Hadoop Version: hadoop-1.0.1.tar.gz
java version "1.6.0_30"
Operating System : Ubuntu 11.10
*Note *: All node were up before starting execution of Program

Kind Regards
Sujit Dhamale
<http://wiki.apache.org/hadoop/UnknownHost>