The error lies in the Codechickencore mod (NEI)
Did you upgrade forge to allow steve's carts 2 ?
Because the version you currently installed from codechickencore is not 1.5.1 compatible
i suggest you download the correct version http://www.minecraftforum.net/topic/909223-14715-smp-chickenbones-mods/
And use the forge version specified to be the most stable
Hope this helps you
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I got the same problem..But I have no mods yet..i just installed forge..
1st i downloaded forge,use winrar to open it,selected all of the files in forge,pasted them in minecraft.jar
,deleted the "META-INF" folder..then i tried running minecraft after that..At first it was loading..but when it comes to 24% loaded..I got an error that says " There was a fatal error starting up minecraft and FML"..Help please
Hmm... You deleted the forge META-INF folder. That would delete forge's modding compatiblity system, so don't do that. I recommend deleting the .bin and starting over [after running minecraft once], this time deleting META-INF before you install Forge.