I have a world that I was playing on as a server running locally, and everything was going great until I tried to update the Tardis mod, after which I get kicked from the server every time I log on with the message "A Fatal Error Has Occurred." I tried uninstalling the Tardis mod completely, but that doesn't seem to have done anything. Oddly though, if I move the world to my "saves" folder, it works fine! But if I move it back to the server folder it does the same thing again. What in the world is going on? I'm not using any official modpack; it's my own collection. I don't know what log file(s) to show, as the game doesn't actaully crash, and the logs I've seen don't say anything other than "Player disconnected."