[Tekkit Pack doesnt work on server.]

See im not sure its a bug or install problem. I also said what the problem was. Also if I knew what the problem was then I would have fixed it myself. Im asking here because maybe there are some common faults that happen? Also I just joined so would you mind posting links :)

[Tekkit Pack doesnt work on server.]

So I got tekkit, I use the tekkit mod pack on single player, why does the pack not work on my tekkit server? I have all the items up on too many items on the server yet it says they do not exist. Would love some help, thanks :)