Schedule report fails throwing 'unknown' error

[Sudha]

Gurus,
My Cognos version is 8.1 MR2 and there is some strange situation, I scheduled a report to run on a daily basis and it failed yesterday throwing an 'unknown' error, nothing else comes up in the message. This happened earlier also what could be the possible reason(s)...

Where does these kind of errors get logged??? Any advice/help very much appreciated.
Thanks!
S

[MFGF]

Is there anything in cogserver.log that relates to your error?

MF.