Hello, when connecting a player on my server, it is disconnected from the server.

Then try again until it works.

I am sending you herewith the pastbin of the error in the server logs.
https://pastebin.com/rt6nUndg

The version of Astral Sorcery used, is astralsorcery-1.12.2-1.8.5.jar.

Would you know about the origin of this error in the server logs, and if it is possible to fix the problem?

Does it happen without Sponge on the sever?

Does it still happen if you update AS to 1.8.8?

Sorry for the slowness of my answers. I will test this in the next few days, I will keep you informed.

If it still happens without Sponge, I'm calling it #513 . If it doesn't happen without Sponge, it'll be an unsupported config.