How many processes do you have for the Output Post Processor. If you have more than one, you may need to search for the error for 12198221 in another OPP log.
Check System Administrator, Concurrent, Administer, then see if Output Post Processor has more than 1 Actual and Target processes. If so, click on the different active processes and search their logs after pressing the Processes button.
As said above, do an ls -ltr FNDOPP* and look in all files during the time it ran. The requestid will usually show up in all logs and one log will have the details...