I've been working on my map for quite awhile now without running RAD, but when I decided to begin running RAD, it gave me a "zero area child patch" error, and my map refuses to compile. I know this means that there is a face in my map with no area, but I do not know how to find that face and fix it. An article at the snarkpit says to look through my map with a text editor, but what am I looking for? How do I fix it?