Originally posted by Jcoasters
an error trapper comes up if the game thinks your cheating or hacking into it.
Changing the volume is cheating too apparently...
Actually, that only happened on older computers. I don't think I've had the error show up on newer systems from volume changes. However, aside from using trainers/hacks (usually if you do the hacks correctly it should almost never give the error), you may encounter a higher tendancy to errors on certain files, or the files simply don't load at all.
It may be possible that a re-install of RCT/RCT2 may fix the issue.