Spool status - Problem

Hi,

We are faicng some batch program goes in probelm status.

I have read in help.sap.com, the description of the problem status is " The spool request has been sent to a printer and has been processed by the SAP spool system."

I can't understand the meaning of "processed by the SAP spool system".

Why few programs goes to problem status.

How to idedify the error data ?

Thanks,

Vimal Alexander