DF2 hosting problem

[His Mother]

Hello, me again. I am having a small problem with hosting maps on Delta Force 2. If I host a stock map, everything works fine. Even if it is stock that I have changed the layout, but everytime I host a map where I have made the terrain myself, everyone who trys to login, gets a height error message and leaves. Is this because they do not have the terrain file installed on their system? Shouldn't it work through my system alone? I have finally figured out how to make terrains and at the risk of sounding bold, I think I make some very good terrains at that. If it is the case that everyone who wants to join in has to have my terrain file, where can I post them so everyone can download them?
Thank you very much in advance,
Erik (AKA His Mother)etcolten30@forepaugh.com