Its doesnt come up in the page i display it

Hi my webpage is http://scsportssurfaces.com/?page_id=71 (password protected: loukas2015) and i put the plugin in a sidebar, and when i add the Facebook url it doesnt show! Why?
I checked it with other Facebook page that already is using your blugin and is fine?
Whats wrong with the new page? The url link is correct 100% sure!

https://wordpress.org/plugins/simple-facebook-plugin/