SERVER CLOSED

sorry for doing so many forums lately, im kinda a noob

my server is running fine and all until i get on. the second i get on my server, im on it for like half a second, and then a message pops up saying "Server Closed". idk what caused this, everything was working fine and then this happened

https://mclo.gs/svuGAro

Quote from Roman

It looks like you're using an 1.13 world on an 1.12 server.

Generate a new world or switch to 1.13

thats weird. my servers always been 1.12.2 and its worked so idk why this is happening ;/

i think its noblenarwhal idk