I've been messing around with a server and I've added plugins for it but I don't know how to add mods like the grappling hook mod for example. I've got it setup so it works in single player but when I try to use a mod-item in multiplayer I get an error message like this
which I believe just means- "I don't know what information you are sending me... grappling what?.."
So how can I install the mod to the server? I tried matching all the installation I did on the client side to the server side but it didn't go through. Is there anything special I'm supposed to do for this?