App not setup: This app is still in development mode

Question

I have followed the instructions here:

The developers of this app have not set up this app properly for Facebook Login?

Made my app public and the circle is

Answer 1

2020 UPDATE

Visit https://developers.facebook.com/apps/ and select your application.

Go to Settings -> Basic. Add a Contact Email and a Privacy Policy URL. The Privacy Policy URL should be a webpage where you have hosted the terms and conditions of your application and data used.

Toggle the button in the top of the screen, as seen below, in order to switch from Development to Live.