problem with require_once
<p>I have a file structure like this</p>

<pre><code>config 
  config.php
library
  data.php
folder
  file1.php
libs.inc.php
test1.php
</code></pre>

<p>In config file iam  including
require_once('libs.inc.php'); and 
require_once('./library/data.php');
In file1.php i am including config file using 'require_once('../config/config.php');'
But it showing error in  require_once('libs.inc.php'); and 
require_once('./library/data.php');
How i can solve this problem Thanks in advance..</p>
