Help Getting LL to work

I installed Loopy Landscapes over a completely functioning RCT, and whenever I try to run it, it says something like, "Exception thrown. Invalid access." Or something.

I'm running Win98.

Anyone know why or how to fix it?
Thnx.

i would un install the whole program, reinstall the original RCT, corkscrew, and then add Loopy Landscapes. Try that. whenever i have trouble with the program, that's what i do