Hi.
I'm using 1.13.2, and Spigot apparently changed the way they use plugin channels. You are no longer allowed to use uppercase channel names, and the channels names must have a namespace and a colon separator in them.
DAFLIGHT-CONNECT should become "daflight:connect", for example.
Trouble is, there is no way to use the current client-side channel names anymore, so this plugin is essentially broken.
Please refer to the linked pull request.