Well. I'm not sure. Is corechickenwhatever a separate download? because there is npothing in the file that says codechicken. There was, however, a 1.6.4 file that I took out of the mods folder because I have no idea what I'm doing that could've been it.
*checking*
It says codechicken in the file. Should I download a new one? Also, and I probably should have lead with this, but what is codechicken?