Problem with graphs

Hi Antonio,
It seems there is a problem with the graphs.
In our affiliate page (http://premium.travailler-en-suisse.ch/espace-affilie), I added 2 graphs :

[affiliates_affiliate_graph interval=”month”] and
[affiliates_affiliate_graph interval=”year”]

While I am logged with an affiliate test (which has worked successfully and recorded activity and clics), nothing appears on the yearly graph (for the monthly graph it’s normal because there was no activity this month).
Can you help me ?
Many thanks in advance.
Regards
David