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 [57] 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!
Download: -REMOVED (don't link cIOS WADs)-
The game might take some time to load but it should. Good luck!