title: The "state" param from the URL and session do not match
body: <p>In facebook documantion </p>
  
  <pre><code>require('include/facebook/autoload.php'); //SDK directory
  $fb = new Facebook\Facebook([
  'app_id' =&gt; '***********',
  'app_secret' =&gt; '***********************'
  ]);
  
  $helper = $fb-&gt;getRedirectLoginHelper();
  $permissions = ['email', 'public_profile']; // optional
  $loginUrl = $helper-&gt;getLoginUrl('http://www.meusite.com.br/login-callback.php', $permissions);
  </code></pre>
  
  <p>When direct it to the url $loginUrl, the return is:
  Facebook SDK returned an error: Cross-site request forgery validation failed. The "state" param from the URL and session do not match</p>