Question

Why does it always happen to me?

This happens after my application verify for user user login and redirect user to the authentication page:

https://www.facebook.com/dialog/oauth?client_id=XXX&redirect_uri=http%3A%2F%2Fexample.com%2Fmyappname%2F&state=YYYYYY&scope=offline_access%2Cpublish_actions

But instead of showing the authorization page, Facebook shows an error page with

An error occurred. Please try again later.

Is there any configuration I have to do before try to authenticate my users?

All is done with PHP using the PHP-SDK classes.

Answer 1

I had the same problem after changing the domain of my site. Altough I properly changed the request_uri parameter and updated my app settings with the new domain, the error kept showing up.
Then I realized that the ID and the SECRET ID of my Facebook APP had automatically changed with no warning!! The whole thing started working again using the new ID.