Unable to get into server. "Internal Exception: Io.netty.Handler.codec.decoderexception: java.IOException: Bad Packet id 26

Game is showing weird issue when trying to log in, its my server. Its set to 1.12.2 and the forge version is 1.14.2 so i dont understand the problem.

[Blocked Image: https://i.gyazo.com/393729b7a4a277ebfebf0d57c6c0b015.png]

https://mclo.gs/om6GwNA is it this?

I sort of need the mods? Which specific mods, if you can tell

Okay, so, I got in as long as I didnt use forge. I guess ill need to switch mods to 1.14? the server seems to be running at 1.14 despite me asking for 1.12