Information

EssentialsX version (run /ess version):
INFO: Server version: 1.12.2-R0.1-SNAPSHOT git-Paper-1349 (MC: 1.12.2)
INFO: EssentialsX version: 2.0.1-b603
INFO: Vault version: 1.5.6-b49
INFO: EssentialsXProtect version: 2.0.1-b603
INFO: EssentialsXSpawn version: 2.0.1-b603
INFO: EssentialsXChat version: 2.0.1-b603
INFO: EssentialsXAntiBuild version: 2.0.1-b603

Server software (run /version):
INFO: This server is running Paper version git-Paper-1349 (MC: 1.12.2) (Implementing API version 1.12.2-R0.1-SNAPSHOT)
INFO: You are running the latest version

Server log (upload logs/latest.log to Gist): https://hastebin.com/yobomuyibu.md

EssentialsX config (upload plugins/Essentials/config.yml to Gist): https://hastebin.com/fevunosaxu.coffeescript

Details

Describe your issue here.
I get this error on startup: https://hastebin.com/juqumogaxi.css

This won't actually break anything on your server. It's just a warning that we're listening to a deprecated event.

It is still kinda annoying but good to know now.

It was a Bukkit config bug. But it is fixed now. Tnxx for the support!