solved Core update 500 error

>php -l router.php
No syntax errors detected in router.php

<?php
/**
 * Jamroom 5 System Core module
 *
 * copyright 2003 - 2015
 * by The Jamroom Network
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0.  Please see the included "license.html" file.
 *
 * This module may include works that are not developed by
 * The Jamroom Network
 * and are used under license - any licenses are included and
 * can be found in the "contrib" directory within this module.
 *
 * Jamroom may use modules and skins that are licensed by third party
 * developers, and licensed under a different license  - please
 * reference the individual module or skin license that is included
 * with your installation.
 *
 * This software is provided "as is" and any express or implied
 * warranties, including, but not limited to, the implied warranties
 * of merchantability and fitness for a particular purpose are
 * disclaimed.  In no event shall the Jamroom Network be liable for
 * any direct, indirect, incidental, special, exemplary or
 * consequential damages (including but not limited to, procurement
 * of substitute goods or services; loss of use, data or profits;
 * or business interruption) however caused and on any theory of
 * liability, whether in contract, strict liability, or tort
 * (including negligence or otherwise) arising from the use of this
 * software, even if advised of the possibility of such damage.
 * Some jurisdictions may not allow disclaimers of implied warranties
 * and certain statements in the above disclaimer may not apply to
 * you as regards implied warranties; the other terms and conditions
 * remain enforceable notwithstanding. In some jurisdictions it is
 * not permitted to limit liability and therefore such limitations
 * may not apply to you.
 *
 * @copyright 2012 Talldude Networks, LLC.
 * @author Brian Johnson <brian [at] jamroom [dot] net>
 */

// Define our base dir
define('APP_DIR', dirname(dirname(dirname($_SERVER['SCRIPT_FILENAME']))));

// prep our PHP environment
ini_set('session.auto_start', 0);
ini_set('session.use_trans_sid', 0);
ini_set('display_errors', 0);
ini_set('log_errors', 1);
ini_set('error_log', APP_DIR . '/data/logs/error_log');
error_reporting(E_ALL ^ (E_NOTICE | E_WARNING | E_DEPRECATED));