use Piwik\Db;
use Piwik\Piwik;
use Piwik\Plugins\UsersManager\API;
+use Piwik\Session;
/**
* Class that implements an authentication mechanism via CAS (Central Authentication Services)
public function authenticate()
{
+ // Make sure Piwik session is started.
+ Session::start();
+
$user = '';
require_once PIWIK_INCLUDE_PATH . '/plugins/CASLogin/CAS/CAS.php';