Thanks for posting that.
Are you using Paypal?
Is it in "test mode" which is only set via database?
Do you have support with us? If not, I can try testing on my own local site.
That really sounds like an issue from way back either in fox or when things imported. It's looks to be missing the owner id for that forum. Would need to see the database to be sure.
Unite doesn't allow for database access. Did you mean for SEPHP? I can move this to the correct area if so.