Adding a face to an existing avatar

[dan12345]

i tried running

female = viz.add('resources/AVATARS/F_business01_adult_highheels_Hi/business01_f_highpoly.cfg')
face = viz.addFace('resources/biohead_talk.vzf')
female.setFace( face, 'Bip01 Head', 'Bip01 Neck' )

the female added is one that comes with the Characters package.
the problem is that when executing this command the old face does not disappear, and instead there is a mess instead of a face. Isn't
setFace supposed to automatically disappear the old face? how can i fix this?

the following commands work just fine, with the default female
character, just for comparison.
female = viz.add('female.cfg')
face = viz.addFace('resources/biohead_talk.vzf')
female.setFace( face )