I have made a server that me and my friends wanted to play on and my brother messed up something.

and now its showing this error and I don't know what to do.

here are the logs: https://mclo.gs/tOJaWYu
I have also checked the logs and didn't see anything wrong with players joining. (I'm not so good at seeing stuff on logs but I do know if something went wrong)
I have also put a screenshot of the error
There are also a lot of mods in it so I hope u dont mind