```
<?php

//this is intializer.php
defined('DS')?  null :define('DS',DIRECTORY_SEPARATOR);

defined('SITE_ROOT')? null :
        define('SITE_ROOT',DS.'C:',DS.'wamp',DS.'www',DS.'photo_gallery');

defined('LIB_PATH')?null:define('LIB_PATH',SITE_ROOT.DS.'includes');

require_once(LIB_PATH.DS.'datainfo.php');
require_once(LIB_PATH.DS.'function.php');
require_once(LIB_PATH.DS.'session.php');
require_once(LIB_PATH.DS.'database.php');
require_once(LIB_PATH.DS.'user.php');

//this is other file where i call php file

// ERROR Use of undefined constant LIB_PATH - assumed 'LIB_PATH' in     
//C:\wamp\www\photo_gallery\includes\database.php  on 

//Notice: Use of undefined constant DS - assumed 'DS' in   
//C:\wamp\www\photo_gallery\includes\database.php on 

include(LIB_PATH.DS."database.php")

?>

```

Any ideas as to what might be causing the error above? Thanks in advance for any help.