require_once with subfolders

I have Folder Home with two subfolders like the following ``` +Home +include - membersite_config.php +iDiscover -index.php ``` in index.php I added the require_once script to access membersite_config.php ``` <?PHP require_once($_SERVER['DOCUMENT_ROOT'].'/include/membersite_config.php'); ?> ``` I get the following error : Warning: require_once(./include/fg_membersite.php): failed to open stream: No such file or directory in D:\Home\include\membersite_config.php on line 2 Fatal error: require_once(): Failed opening required './include/fg_membersite.php' (include_path='.;C:\php\pear') in D:\Home\include\membersite_config.php on line 2 The error says No such file or directory while the The path "D:\Home\include\membersite_config.php" is correct . When I move index.php to be under the root , the page works well. I also tried to use the following code as described here but it gives the same error ``` <?PHP define('ROOT', 'D:Home\\'); require_once(ROOT ."/include/membersite_config.php"); ?> ``` Edit : I too tried require_once("../include/membersite_config.php"); And it gives the same error Thanks in advance