error during rman backup

Hi

I have Oracle daily full backup scheduled through EM.
 this backup fails with the message bellow.

What can I do to prevent this from happening?

I am getting a error message during Rman backup.the message is------

        started            May 11, 2011 12:30:12 AM EDT
      Ended            May 11, 2011 12:32:07 AM EDT
      Step Elapsed Time            1 minutes, 55 seconds
        Status            Error
        Error Log:-

Step aborted because agent went down
banumynameAsked:
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banumynameAuthor Commented:
i check all agent log's while running these backup's there is no agent issue & agent up & running 100%
OP_ZaharinCommented:
- check in the windows services if OracleJobScheduler<instancename> is running
banumynameAuthor Commented:
oracle_ scheuler is running finely because whatever job i schduled is running fine at the end of the job its says status= error instead of success  with out no reason

in error log i find

Step aborted because agent went down

but agent is running fine .
OP_ZaharinCommented:
- have you try to stop and restart the dbconsole services? and then schedule the backup again.

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