Question : PHP error

within usermanagement of our mediawiki I get the attached error.
What does this mean and where have I to look for the error?
Which file?

For me this message is a little confusing

1: 2: 3:

PHP Warning: require_once(../../config/hw_document_root.php) [function.require-once]: failed to open stream: No such file or directory in C:\Inetpub\wwwroot\mediawiki\hallowelt\WikiAdmin\UserManager.php on line 10 PHP Fatal error: require_once() [function.require]: Failed opening required '../../config/hw_document_root.php' (include_path='C:\Inetpub\wwwroot\mediawiki\hallowelt\lib\Zend') in C:\Inetpub\wwwroot\mediawiki\hallowelt\WikiAdmin\UserManager.php on line 10

Answer : PHP error

Try this

require_once("./config/hw_document_root.php");

Thanks