Tekkit Lite server help

[peeves91]

Hi all! I just made a tekkit lite server for myself, and for nobody else to join. I don't need to do port forwarding or anything to join it. I start up tekkit lite and use 'localhost' for the server, and I can join just fine. However, when I try to put my tekkit lite single player word in, I lose all the tekkit items, and I can't spawn any of them in. Any help is greatly appreciated.

[Meems33]

What do you mean by "when I try to put my tekkit lite single player word in"?