Ошибка при регистрации. Как исправить?

Fatal error: Class 'StopSpam' not found in /home/p756586/www/site.ru/engine/modules/register.php on line 118

        include_once ENGINE_DIR . '/classes/stopspam.class.php';
        $sfs = new StopSpam($config['spam_api_key'], $config['sec_addnews']);
        $args = array('ip' => $_IP);