Attack Of The B-team

[AlphieAM]

I have recently bought a minecraft server which I then turned into a Attack of the b-team server (with some help). But once I go into the game and try to craft something that is a mod, for example Witchery it wont let me craft it. When i put the materials into the correct order it shows the image of the object i want to craft but it wont let me take it out of the crafting table. Can anyone help me with this indecent?