If that crack is really into the carbon shell then the options are to have an expert like Calfee repair it or replace the frame. The picture shows what seems to be a metal insert that is cracked and that would have to be replaced which will also require expert repair since it is certainly bonded in.

BTW, some manufacturer's have a lifetime warranty for the original owner for their frames. If you are the original purchaser and have your sales receipt, contact the manufacturer about a warrantee replacement or major discount on a new frame.