This little guy one day just started appearing. Not sure why, Custom Modpack 225 Mods, this never had issue before. Even on new World Creation, or even my server.

http://pastebin.com/26mnQYLB

After some investigating, the error only occurs in the latest forge builds after 1291; they are 1307 and 1340.

Oh /now/ it makes sense. Forge versions beyond 1291 are for Minecraft 1.8! You have the wrong Forge! xD

I actually take it back, builds beyond 1291 exist, they just don't seem to show as usual Forge builds. I'll look into the matter as best as I can.

tentative fix in the upcoming version. Reopen this please if the bug persists in V1.1.3