private function callError404()
    {
        list($controller, $method) = explode('@', Config::get()['error404']);

        if (!class_exists($controller)) {
            throw new OrmException('Class "'.$controller.'" not found.');
        }
        
        $controllerInstantiate = new $controller();

        if (!method_exists($controllerInstantiate, $method)) {
            throw new OrmException('Method "'.$method.'" not found in '.$controller.'.');
        }

        return $controllerInstantiate->$method();
    }