spidercaths13hyt

I've been trying to created a modded server with this mod called, "NostalgicTweaks" and every time I do /join ________ it loads for a second and then says However, it doesn't join and then says I don't know what to do. Ive tried putting the mod in my games mod folder but it still give the same message Is there anything that I am missing that gets this to work? I'm new to minehut hosting so it may be a simple mistake