Mod causes internal exception java.net.socketexception connection reset

So I am making a Sonic mod and it used to work perfectly in multiplayer servers. Now for some people, whenever I have my mod in the server, the player will be able to join the server, get teleported in one place, won't be able to break blocks(they respawn after breaking) and then after a minute they get disconnected with the error: "internal exception java.net.socketexception connection reset" I have no clue what could be causing this. This is the workspace file if needed https://drive.google.com/file/d/1dVaIH73jtzG7YPNy_6bodViYsbbS6uJW/view?usp=sharing
I am so close to finishing the mod but this is the only thing that is stopping me.