I have setup a server and it has crashed multiple times after I added in new mods.
It appears that pixelmon does not work with the new mods. For clarification I had the mod on the server before addings mods: Obsidiplates, Thermal Expansion, I updated Project Red, Thermal Foundation, and Extra Utilities.
http://pastebin.com/XT5RMQ51
Crash Report ^
If it matters I am using Mcprohosting and not running it from my own computer.