R help - Nov 2004 - geese

I am working with geese from geepack, does
anyone know how to get the predicted values
from this program. I tried the predict function
and got the error

Error in predict(results.e, newdat = prog) :
        no applicable method for "predict"

Thank you for any help you can send,
Suzette

================================Suzette Blanchard, Ph.D.
UCSD-PPRU