Server Crashes on startup.

So I've recently been abroad, and I've ported a server I have with some friends to play. The port doesn't work so I port the world over onto a server hosting platform. When I got back, I downloaded the world back onto my PC, downloaded a 20w08a server, put it in a folder, then started it. It loads the EULA, server properties and logs just fine, but after i change the EULA to true, and start the server again, it loads up to "using default channel type," then crashes. The server properties file is unchanged, and I haven't put the world folder in yet, so how can I fix this? (If it helps, NoIP is connected to my IP)