title: Redirecting to authentication dialog - "An error occurred. Please try again later"
body: <p>Why does it always happen to me?</p>
  
  <p>This happens after my application verify for user user login and redirect user to the authentication page:  </p>
  
  <p><code>https://www.facebook.com/dialog/oauth?client_id=XXX&amp;redirect_uri=http%3A%2F%2Fexample.com%2Fmyappname%2F&amp;state=YYYYYY&amp;scope=offline_access%2Cpublish_actions</code></p>
  
  <p>But instead of showing the authorization page, Facebook shows an error page with </p>
  
  <blockquote>
    <p>An error occurred. Please try again later.</p>
  </blockquote>
  
  <p>Is there any configuration I have to do before try to authenticate my users?</p>
  
  <p>All is done with PHP using the PHP-SDK classes.</p>