by brandon_g Sun Nov 01, 2015 8:59 pm
This means your app is still set to to 'Testing/development mode', which means your app isn't public and only certain users such as the developer and any testers he may set can use the app. To make the app public, you need to go to your dashboard, under your app name, but over your app id stuff, click on the little question mark.
This wilk take a screen that says 'Do you want make this app and all its live features available to the general public?' you will see a little slider with yes and no, slide it to yes.
Your app should then be public and work properly.
Note: If you are trying to connect using this feature to the facebook account used to create the app (the one your logged into on FB Developer), it will probably still show you an error, but this does not mean your feature is not working, its just not working for YOU, anyone else it should work. I figured this out when it wouldnt work under my personal fb account, but would under a secondary account I created for the forum.
-Brandon