When you’re trying to log in to Facebook and receive this error message, usually it’s due to a setting in your account that prevents GAIN from connecting with Facebook.
Make sure you are logged into Facebook in your browser first. Then follow these steps:
- On Facebook, in the top navigation, click the downward arrow and select Settings.
2. Then click on Apps.
3. In the section Apps, Websites, and Plugins make sure it reads Enabled
Check if GAIN shows up on the list to see if there are any settings blocking the app from connecting.