You might be getting this error message on startup because the RiverCAD XP profile is only being inherited from the default installation settings and not from your "user" settings.
Please try the following steps:
1. Open AutoCAD without RiverCAD XP.
2. Go to Options->Profiles and delete the "RiverCAD" profile.
3. Make a copy of one of your working profiles or another valid profile.
3. Rename the copied profile as "RiverCAD".
4. Quit out of AutoCAD and start up RiverCAD XP.
This should solve the problem. If not, you may need to re-install RiverCAD XP. Let me know if you continue to have problems.
Sincerely,
Chris E. Maeder, M.S., P.E.
Senior Technical Engineer
chris.maeder@bossintl.com