I am trying to run a custom modpack server for 1.5.1. This is the error I am getting: http://pastebin.com/B7bghuAA

 

It happens when I add more than a few mods. I spoke to someone who said that it was a mod that requires other mods to work ie Gregtech needing IC2. However I have double checked that this is not the case since I can install Applied Energistics yet I can't install forestry or IC2 which have no other required mods. I have been at this for a couple of days now and I am getting quite frustrated. Any help would be appreciated.

This is the case, the screen should show you which mod you need if not it's in your actual log file not MC's crapy one.

The odd thing is that it doesn't say which one it is and I can't find which one it is since multiple seem to be causing the error.

It does, look in your log.

Can you point it out to me like I'm a 5 year old cause I've looked it over like 6 times now and I can't see it.

Solved it by finding a MC 1.5.1 server jar instead of using the one on minecraft.net and going into the build history of forge and getting the latest 1.5.1 release instead of the one on the forum thread.