Smarty arbeitet nicht mehr mit Namespaces?

<?php
namespace controller\template;
use controller\system\Router;


require_once("SmartyBC.class.php");


class Template extends SmartyBC {
    public function __construct() {
        parent::__construct();


        self::setSmartyDirectory();
    }


    /** setSmartyDirectory
     * Access: Private
     */
    private static function setSmartyDirectory(){
       if(Router::getLocation()=="Frontend"){
           $this->setTemplateDir('template/frontend/templates');
           $this->setCompileDir('template/frontend/templates_c');
           $this->setCacheDir('template/frontend/cache');
           $this->setConfigDir('template/frontend/configs');
       }
       else {
           $this->setTemplateDir('template/backend/templates');
           $this->setCompileDir('template/backend/templates_c');
           $this->setCacheDir('template/backend/cache');
           $this->setConfigDir('template/backend/configs');
       }
    }
}