Keeps timing out and then crashing

Hello!

Me and my cousin are playing on a server, but recently we can't get on the server anymore. When we start the server, it opens normaly, but when you click join, it gets stuck on "Connecting to the server". After some time it times out and the server stops saying it crashed. Can anyone help? Thanks!

Here is the link: https://mclo.gs/lgNtiGt

I ran the server once again and this time it crashed before I could even try to get in. These are the logs of that crash: https://mclo.gs/WG41wPu

It's wierd that it's crashing but logs aren't showing anything.