Server is crashing on startup after upgrading from 5.10.1 to 5.11.1.
Server worked perfectly fine up until upgrading.

Expected Behavior

Server starts

Current Behavior

Server doesn't start

Log

https://gist.github.com/sshawnsamuell/fc127633b6eb6ce04575b7e40709ee5c

Looks like all of the mods were loaded on the server, so it crashed when trying to load the world. Have you tried letting the server just make a world to make sure it works? If so, it might be something with the world itself.