2010-09-04, 19:02
I saw this error before. It has to do with launching games that use more than one rom file (or maybe the dupes you mentioned): RCB finds more than 1 rom file for the game that it should launch and then searches for {}-brackets in the emuCmd. If it does not find brackets you will get this error (I will fix this soon). Maybe check this part in the wiki for details.
Does MAME support games with multiple rom files? If yes, how?
Does MAME support games with multiple rom files? If yes, how?