Problem with "call_partials"

[vittoriopolto]

Hello,

I have a problem with the h.call_partials in xhtml

I had installed tgext-pluggable.
I use ${h.call_partial('cardwiki.controllers.partials:card_deck', deck=deck)} inside xhtml
and in /controller/partials.py i have the function:
def card_deck(deck): return dict(deck=deck)

but at runtime i receive the following error:
AttributeError: module 'cardwiki.lib.helpers' has no attribute 'call_partial'
seems that he try to use lib.helpers.call_partial instead of the pluggable helpers.

What i'm missing?