Issue: Error when installing a fresh install

Parse error: syntax error, unexpected T_PAAMAYIM_NEKUDOTAYIM in .../vault/core/model/vw.php on line 173

***
/**
 * You can choose the default script here.  Uncomment the appropriate line
 * to set the default script.  Note: Only uncomment one of these, you must
 * add // to comment out the script(s) that you DO NOT want to use as your
 * default script.
 *
 * You can choose the default script even if you do not plan to move this
 * file to the root of your website.
 */

/**
 * Use the CMS as the default script:
 */

// define('VW_DEFAULT_SCRIPT', 'content.php');

/**
 * Use the forum as the default script:
 */

 define('VW_DEFAULT_SCRIPT', 'forum.php');