[Hadoop-common-user] Task process exit with nonzero status of 126

Hi,
Today I have a problem with run job on hadoop with the log message "Task
process exit with nonzero status of 126 Error reading task ouput.....",but I
can put iles in HDFS or get some files from HDFS sucessfully. I formated
the namenode and start hadoop without any error log messsage, when I run job
it report the same error message again. I also restart my computer but it
doesn't work.

Thanks
HRoger