Scheduler Errors when trying to add an IMR report to scheduler

[JGirl]

My other issue for the day:

When I try to add a new item to the scheduler (in this case it is an impromptu report), I am getting the following (unbelievably helpful) error message:


Error Number: -2147417851
Error Description: Automation error. The server threw an exception.  OK


This error message is appearing after I've done the following:

1.  Go into scheduler, and choose to add a new task. 
2.  Select an impromptu report to add
3.  Set the schedule for the report
4.  Click OK to accept - I'm now being prompted for the catalog user class
5.  As soon as I select the catalog user class and click OK the error is coming up and the item isnt added to the schedule.

Any ideas??

Cheers
J