Facebook error: The parameter app_id is required

Hi I get an error when trying to send out invitations using Facebook. Spcifically when I click the Facebook icon I get this connection error – The parameter app_id is required. The other service providers like Google, Twitter etc. are all fine.

I am using the Facebook feature in a BuddyPress environment

http://goo.gl/wvzDIi

https://wordpress.org/plugins/wp-social-invitations/