I'm sorry, I don't have any experience with JoiPlay so I doubt I can help with it.
Does the game work without our mod? The only thing I can suggest is to try running the un-modded game first and then add our mod but it's basically a shot in the dark
Nothing, this new version of the game,at least for me in my phone does not work with this mod and I install the mod after opened the game, the game simply crash
