AmpArts

I have confirmed all the mods are 1.15.2 and they all work in my single player MC, (Despite 2 saying they don't load), but I checked a duplicate of the server with a different world on my alternate PC and it actually runs but with no data or progress. When I transferred the world folder over is when the server started to crash on start-up. Is there a way to roll back the server by one save without it being a bukkit/forge server?

I have started having issues with my server starting to randomly crash and I looked each and every "resolution with the error description: "Exception in server tick loop" and tried it all, but nothing works. I hope my friends and I do not need to reset the world and/or our characters since we are finally nearing the end game. Here are the crash report and latest logs: Crash Report: https://pastebin.com/XHQMW9XU Latest Log: https://pastebin.com/iFxxDcGx I'm studying Java but I am still a novice so any help and education would be appreciated.