When i start the server the server.jar it starts up like a vanilla server it doesn't say loading "mod" or something like that like the other modpacks and when i go on the server and try to give myself something it says "no item with that id" and if i give myself it through creative mode and try to place it down it disappears. I can place down normal blocks but not anything from a mod. Whats going on? Do i have to start up the server in some special way?