Mathjis

Okay so, let me start by saying that i don't know if this is the right place to ask this, if it is not i apologize in advance. So here's the problem, i host a modded minecraft server for a bunch of friends, i want to be able to connect to this server troug a hub in a bungeecord network. The problem is that when i try to connect to the (spigot) server i get the following message: "Incomplete set of tags receiver from server. Please contact server operator." If anyone knows a way to fix this i would be incredibly gratefull!