Can you give me an example of which game says this error?
For example, if I want to run Sonic the Hedgehog on Megadrive(Genesis), I'll do:
fba md_sonic
or for Ghouls 'n Ghosts (Dai Makai Mura) on PCEngine SG-X:
fba sgx_daimakai
The romset prefix (md_ sgx_, etc) is so fba can tell which system to emulate, the romset files on the other hand are just named sonic.zip and daimakai.zip.
hope that helps!
best regards,
- dink