Readme says:
"You must copy all the *.CK* files in a directory and the .nds file in the same directory."
"WARNING ! ALL THE FILES MUST BE CAPITALIZES !"

And it mentions a list of which files need to be present.
Did you do all that?


I checked out the source code, but there's no mention of an "error in game" message, meaning it's probably an image, and I can't check what causes the error.