I've seen many with this issue of Just Dance games (mainly JD 2015) and I know the fix as I have been through this problem before. The problem is you are missing IOS 224  5.1R. You need this specific IOS revision to make the game(s) work. Install this IOS (I used WiiMod) and then load USB Loader GX and click on a game. Instead of launching it go to the game settings and change boot IOS to 224 so USB Loader GX will use IOS 224 for this game. Download: -REMOVED (don't link cIOS WADs)- The game might take some time to load but it should. Good luck!