getVertsFromGroup(...) python guide needed

i am trying to get vertices from a group… say named ‘group’
i tried
mesh.getVertsFromGroup(‘group’)
it did not work… saying something like “mesh contains no deform vertices”

i already assigned some vertices in the group (in the assign button)

Any help is much appreciated…
Thank you

I am getting the same error with 2.46; any information since 2006?