Dear mrushton
Is this error occurring when AR is actually performing the YE procedure, or when you are printing a report? It's reference to the report definition not being able to be opened because something already exists suggests a report.
Has anything happened recently on your system (or the Server) that could have affected this?
Have you tried rebooting your PC? I would try this first - then, if this does not resolve it, remove the CRWIN program directory and reinstall Receivables.
Please let us know if this helps.
Regards,
Softrak Support