That error happened to me when I used the version of nesDS included with TWiLightMenu. Just use the GameBrew download link and the hex edited FDS roms will work fine. Sorry for the necrobump again but I'm sure many people have come across this thread in google searches wondering the same thing.
I've got enough money and I am currently in the market for a flashcard for my old DS which I've heard many great things of. I'm interested in it's emulation capabilities especially with it having a CPU many times faster than the ARM9 chip. Though I can't seem to find anywhere to buy one. All of...