Before using Crap or WiiGSC, you have to postfix Game ID to the wbfs game file.
For example:
Change "Grand Slam Tennis (USA) (En,Fr).wbfs" to "Grand Slam Tennis (USA) (En,Fr)[R5TE69].wbfs"
[R5TE69] is the ID which you will get from gametdb website by simply searching by the game title and...