My server launches completely fine and then when I add sponge it crashes here is my log help <3 Vanilla 1.12.2 Crash Report [#dHqGQrL] - mclo.gs
The error your getting is that your server currently has the log4j vulnerability.
For your servers safety (as well as your players) sponge doesnt boot on vulnerable servers.
To fix this, update Forge using the forge installer