View file application/modules/Core/views/scripts/error/notfound.tpl

<?php
/**
 * SocialEngine
 *
 * @category   Application_Core
 * @package    Core
 * @copyright  Copyright 2006-2020 Webligo Developments
 * @license    http://www.socialengine.com/license/
 * @version    $Id: notfound.tpl 9747 2012-07-26 02:08:08Z john $
 * @author     John
 */
?>

<h2><?php echo $this->translate('Page Not Found') ?></h2>

<p>
  <?php echo $this->translate('The page you have attempted to access could not be found.') ?>
</p>

<br />

<a class='buttonlink icon_back' href='javascript:void(0);' onClick='history.go(-1);'>
  <?php echo $this->translate('Go Back') ?>
</a>