gpsphone help

[xsldeathx]

i have the gps phone on my iTouch and and trying to load my gba games to the iTouch. I extract the files using winrar and have a file called GBA in the rom files on my iTouch. the files i am putting in are called for example insertnamehere.gba. when i load up the gpsphone and click the game to play it the botton screen loads up but at the top it says, "Sorry, but ipsp requires a gameboy advanced anWincorrect iso image." what does this mean and what do i need to do???

thanks so much,
Dominic