Ultimate Facebook with Events+ and Membership2

Hi
I am struggling abit with a new site I am putting together. I keep getting the following message :-

'You will need to configure your Facebook app for Social RSVPs add-on to work properly'

The site is http://love-entrepreneurs.com/

The plan it is a membership site with Events+ plugin and Ultimate Facebook.
I have set up the Facebook app and I believe it is set up correctly, (might be very wrong)
I am unable to device where to go net to find the problem.

Are you able to give me a steer or point me in the right direction. I have been through the documentation and youtube videos but still stuck.

Happy to give you admin login if it helps.

Many thanks
Andrew