If you try to connect to a server with the mod disabled on the server, it refuses to connect.

Client Log- https://gist.github.com/ProsperCraft/af29bb9525d9c41be5eb01a1a7764066

That is not an issue with the mod. You shouldn't be running mods on the client that have heavy serverside components without the mod on the server. This should be reported to reliquary at the very least, as they are trying to craft an unregistered item on the server