Plugin is not working

Hi,
I installed your plugin but it doesnt work (widget or in a page).
It is in the left widget area between “rechercher” and “galerie photos” if you look at the link to the page.
My WordPress is a 4.6.12 one. My Adblock is not active on the website page.
I well wrote the name of Facebook url “alpesspiritchapter.annecy”.
I dont understand what is wrong.
Many thanks in advance.
Best regards.

The page I need help with: [log in to see the link]