class CmsController extends CmsControllerCore
{
    public function setMedia()
    {
        parent::setMedia();
        $this->addCSS(_PS_CSS_DIR_.'jquery.fancybox.css', 'screen');
        $this->addJqueryPlugin('fancybox');

    }
}
<br />
<b>Fatal error</b>:  Uncaught Error: Class 'CmsController' not found in /home/u878161055/domains/toitert.com/public_html/classes/controller/Controller.php:233
Stack trace:
#0 /home/u878161055/domains/toitert.com/public_html/classes/Dispatcher.php(510): ControllerCore::getController('CmsController')
#1 /home/u878161055/domains/toitert.com/public_html/index.php(28): DispatcherCore-&gt;dispatch()
#2 {main}
  thrown in <b>/home/u878161055/domains/toitert.com/public_html/classes/controller/Controller.php</b> on line <b>233</b><br />