Adding Mods?

[coconut421174]

So I've recently started a Hexxit server with my friend and we love it, but we've been adding some mods into the pack. We already added the Dragon Mount mod and I'm looking to add the Decocraft mod into the game for some more decoration. Problem is is that when I put the mod, which is a .zip file for 1.5.2, into the mod section of Hexxit, the game crashes. This happens too when I add it to the server's mod folder. I know that some mods aren't compatible with what's already there, but does anyone know about this one? Just kind of looking for a definitive answer. Thanks!

[JaariAtmc]

Please add the launcher log and or crashreport. Please upload it to www.pastebin.com or paste.ubuntu.com and share the link to it here.
As much as we regret it, we have no psychic powers and therefore cannot read your mind or files off your computer...