Why Facebook login returns 500 error?

Question

I instealled Question2Answer at http://www.fotocomefare.com/domanderisposte and integrated it with wordpress.

I got an API key and set the website URL as http://www.fotocomefare.com/domanderisposte/, while the app domain as fotocomefare.com.

When I click on the facebook login button it get this errore (in Chrome):+

Server error
The website encountered an error while retrieving http://fotocomefare.com/domanderisposte/. It may be down for maintenance or configured incorrectly.
Here are some suggestions:
Reload this webpage later.
HTTP Error 500 (Internal Server Error): An unexpected condition was encountered while the server was attempting to fulfill the request.

 

What am I doing wrong?

Answer 1

If you're using external user integration, it's not possible to use the Facebook plugin. Future versions of Q2A will automatically disable login modules if external user integration is being used.