Fatal error: require_once

[vernaalcalde]

Hola de nuevo. Os copio el código completo. Agradecería que fuerais lo más precisos y literales posible porque poca idea tengo de todo esto.
Muchas Gracias

Código PHP:

<?php 
/**
* @version: $Id$
* @copyright: Copyright (C) 2006-2008 Elxis.org. All rights reserved.
* @package: Elxis
* @subpackage: Loader
* @author: Ioannis Sannos
* @email: [email protected]
* @link: http://www.elxis.org
* @description: Elxis loader
* @license: http://www.gnu.org/copyleft/gpl.html GNU/GPL
* Elxis CMS is a Free Software
*/
 
defined( '_VALID_MOS' ) or die( 'Direct Access to this location is not allowed.' );
 
 
//Load eUTF for UTF-8 string handling
require_once( $mosConfig_absolute_path . '/includes/Core/utf8.class.php' );
//example of use: eUTF::functionname()
 
//Load and Initialize FileManager
require_once( $mosConfig_absolute_path . '/includes/Core/filemanager.class.php' );
$fmanager = new FileManager;
 
//Load Elxis Core
require_once( $mosConfig_absolute_path . '/includes/Core/elxis.php' );
 
//Load Language
if (defined('_ELXIS_ADMIN')) {
    //Elxis admin language
    require_once( $mosConfig_absolute_path . '/includes/Core/alanguage.php' );
    $elxis_language = &new ElxisLang();
        if (isset ($_GET['mylang'])) {
            $elxis_language->changeLang(trim(strip_tags($_GET['mylang'])));
        } else {
            $elxis_language->getLang();
        }
    $alang = $elxis_language->alang;
 
    require_once( $mosConfig_absolute_path.'/includes/Core/locale.php' );
    eLOCALE::set_locale( $alang );
 
    require_once( $mosConfig_absolute_path.'/administrator/language/'.$alang.'/'.$alang.'.php' );
    require_once( $mosConfig_absolute_path.'/administrator/language/'.$alang.'/'.$alang.'.gemini.php' );
    $option = strtolower( mosGetParam( $_REQUEST, 'option', '' ) );
        if ($option == '') { $option = 'com_admin'; }
 
        if (@file_exists ($mosConfig_absolute_path.'/administrator/language/'.$alang.'/'.$alang.'.'.$option.'.php')) {
            require_once ($mosConfig_absolute_path.'/administrator/language/'.$alang.'/'.$alang.'.'.$option.'.php');
        } elseif (@file_exists ($mosConfig_absolute_path.'/administrator/language/'.$alang.'/'.$alang.'.com_'.$option.'.php')) {
            require_once ($mosConfig_absolute_path.'/administrator/language/'.$alang.'/'.$alang.'.com_'.$option.'.php');
        } else {
            require_once ($mosConfig_absolute_path.'/administrator/language/'.$alang.'/'.$alang.'.com_admin.php');
        }
    $adminLanguage =& new adminLanguage();
    require_once ($mosConfig_absolute_path.'/administrator/language/'.$alang.'/'.$alang.'.xml.php');
    $xmlLanguage =& new xmlLanguage();
} else {
    //Elxis frontend language
    require_once( $mosConfig_absolute_path.'/includes/Core/language.php' );
    $elxis_language = &new ElxisLang();
    if (isset ($_GET['mylang'])) {
        $elxis_language->changeLang(trim(strip_tags($_GET['mylang'])));
    } else {//a2
        $elxis_language->getLang();
    }//t2
    $lang = $elxis_language->lang;
 
    require_once( $mosConfig_absolute_path.'/includes/Core/locale.php' );
    eLOCALE::set_locale( $lang );
 
    require_once ($mosConfig_absolute_path.'/language/'.$lang.'/'.$lang.'.php');
    require_once ($mosConfig_absolute_path.'/language/'.$lang.'/'.$lang.'.gemini.php');
    
    //require_once ($mosConfig_absolute_path.'/language/'.$lang.'/'.$lang.'.xml.php');
    //$xmlLanguage =& new xmlLanguage();
}
 
require_once( $mosConfig_absolute_path.'/includes/Core/preflang.class.php' );
 
?>