Hey, I just finished installing some mods because i was gonna do a playthrought of Quad Mountain Survival, and i just tried to go on the server and it says i cant log in! I dont know if i am supposed to be posting this here, but i didnt know where else to post it to. These are the mods i installed:

Rolf even's Niftycraft, and
SanAndreasP's Clay Soldiers mod.