Loading singleplayer world crashes server

Yesterday, I transferred a world from this computer to my other computer, and renamed it (from Life V2 to Life V2.1). I connected to the world from the second computer, and made a LAN server for my friend to join from this computer. Today, when I tried to transfer the world back from that computer to this computer, I renamed it to Life V2.2 and tried to enter it. "Server closed" popped up for a split second, and then the game crashed. I looked around the forums and I think this has to do with it being a LAN and connecting to it from a different computer. I tried connecting to the world I was playing in yesterday with the first computer, and it worked. Does it have to do with a different computer?

The crash log: https://dumptext.com/RwxntP0s

Please advise.

Thank you.