[Seaside] fullcalendar on seaside 3.1 not work

[Oswall Verny Arguedas C.]

Regards,

I use Seaside 3.1, Pharo 3.0,  on Ubuntu 14.04.I need to use fullcalendar on JQWidgetBox but does not work.
When I try to access it with url:     http://localhost:9090/jquery-widgets/fullcalendar

Error message is:
MessageNotUnderstood:  receiver of "encodeCollection:on:" is nil
Thanks for the support
Oswall 
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