Basically I was playing a world like 3 hours before and everything was fine, 3 hours later I joined again and it just showed this error, I tried contacting support, they just said submit a bug here. I tried searching up how to fix it, it said get rid of all your add ons. I'm not going to get rid of all my Addons which basically destroys my world. No one with a world that has so much progress and people playing on it would. Please fix this bug ASAP as it's very very annoying and we can't play on it.