Look at the file e frontier/Poser 7/Runtime/heads/knownFaceRoomHeads.xml

I got the same error after installing the Poser 7 SR1 and some of the Face Room files so I started looking through all the xml files and that one only had one line in it!

If you have downloaded the Apollo Maximus core zip, you can replace the xml file with the one from Apollo's files.

If that is the problem, it should fix it (hopefully!)

~ Meow ~