Hello Pankaj,
which version of CMOD do you have?
What is the size of the file you are trying to archive?
Do you use TSM? If yes, do you have something in the logs of TSM?
Is there something in the "System Log" which might help in finding this problem?
Do you have enough disk space to save this document?
How many documents to index? 2478 or more?
It might have something to do with Storage Object size... but not necessarily.
Cheers,
Alessandro