Can't connect to own created world

I just got done clearing the ruins in my world when I went to get off the game. I exited and saved in the caves closing the game then shutting off my computer. When I later opened the game I firstly noticed that my settings went back to their default state (ex. Fullscreen switching to Windowed) so I changed them back to what I originally had them set to, then went to start up the world I've been playing on. Though, when I tried to start it, I got the error as shown in the image. I tried to Rollback, (Which all the rollback states were set to the same day being "Day 204 - Summer") turn off all my client mods, (the world didn't have any mods enabled) Uninstall / Reinstall,  and validating the files. The world is a local one player set game with default settings. I'm also able to play on my other worlds, and even play online.