title: Facebook sdk php login error
body: <p>from today I have a problem with facebook login on my web site. The error is </p>
  
  <pre><code>An active access token must be used to query information about the current user
  </code></pre>
  
  <p>I didn't changed anything. 
  I use open graph v2.6 and my call is:</p>
  
  <pre><code>https://graph.facebook.com/me?fields=email,name
  </code></pre>
  
  <p>I'm using php 5.6 Codeigniter 2</p>
  
  <p>Thank you for your help</p>