I am not familiar with this particular error message, but the facial rigging system in Advanced Skeleton is pretty finicky. I have found that the best way to work with it is to save versions of the file as you progress. So a file with the body built but not the face. Then another file with all the face guides setup. Then another one after a successful face build. That way if you get an error you can quickly jump back to the previous save and start over.
I would suggest removing all the face guides you have set up and start that process over again.
