CrafterCentral

I've been making a modpack for me and my friends to play on but every mod works except flans. There isn't any guns or parts from flans whenever I load it up from the modpack, but whenever i load it up client-side it has everything. Please Help this is the first time I've ever made a technic pack and could really use it! Dropbox link: https://www.dropbox.com/s/vh4rh9num7n6m8i/Crafter%27s%20Essentials.zip?dl=1