how do i make a clone fighter

[Brawl_Master_3605]

Hi guys im currently working on a melee mod to make it look more like my favorite smash game brawl and just for fun i wanted to add lucina even tho she is from smash 4 and im using the m-ex tool to do this but as i made her a clone of marth the game will just crash even if its a fresh iso can anyone help to fix this like do i need other applications or anything?

-ps i posted it twice in the melee workshop bc i didnt know where to post because there can be to that can help