I'm getting this error too.??Attempted to remove the data folder, that didn't help.??I'll try changing the load order of the data files, but I have a hunch that this crashing will continue.
EDIT: I seem to have fixed the problem.??I'm using the full installation on Windows XP Pro.??I downloaded the first two files from the
RMS full client download page, let them patch completely, and that fixed all of my crashes while in Prontera.??Let me know if this fixes things.