Thanks yang. Can you please tell me what i need to do for this..?
I am new to the networker.

Regards,
Pd77.

Library has some standard ASC and ASCQ numbers which are used as error number ids for errors. Error you were getting was temperature related (so either you are not utilizing air conditioning or someone is smoking inside your library). As this warning/error comes from library NetWorker has nothing to do with it - it is just affected party because if library refuses to work to cool itself NW won't be able to do any operation either. You should check library health and temperature ASAP.