tapestryZone is not a function

Hi I have the following code:

<t:zone id="playerPenaltiesZone" t:id="playerPenaltiesZone">
</t:zone>
<t:select
t:event="playerTeamChange"
t:model="prop:teamModel"
t:value="team"
zoneUpdater.zone="playerPenaltiesZone"
t:mixins="jquery/zoneUpdater"
t:clientEvent="change"

When I try change the select I see the folling in the firebug console:
TypeError: $zone.tapestryZone is not a function zoneupdater.js (line 16)
params : params

Any Ideas?