[AccessD] compile error

Hi.  Can anyone suggest how I might proceed here?

I am working with an Access 2003 app developed by someone else.  When I try to compile the code, I get an error “User defined type not defined”.  However, unlike other errors where you get taken to the rogue code and highlighted, in this case there is no clue given to the specifics of the problem.  And I have no idea where to start looking.  Any ideas?

Thanks.

Regards
Steve