[SM-USERS] help needed

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Dear Expert,
                     This is my second post for the same problem and
this time hope i will get the answer. I am using retriveuserdata
plug-in for auto filling user's personal information from ldap server
but after using this plug-in other plug-in stop working and  when i
look apache logs for the error i get the following -

[Thu Aug 27 18:07:29 2009] [error] [client 192.168.4.252] PHP Warning:
 require_once(../config/config.php) [<a
href='function.require-once'>function.require-once</a>]: failed to
open stream: No such file or directory in
/var/www/html/plugins/retrieveuserdata/ldap.php on line 33, referer:
http://192.168.4.5/src/left_main.php
[Thu Aug 27 18:07:29 2009] [error] [client 192.168.4.252] PHP Fatal
error:  require_once() [<a
href='function.require'>function.require</a>]: Failed opening required
'../config/config.php'
(include_path='.:/usr/share/pear:/usr/share/php') in
/var/www/html/plugins/retrieveuserdata/ldap.php on line 33, referer:
http://192.168.4.5/src/left_main.php

SquirrelMail version:	1.4.9a
Config file version:	1.4.0
Compatibility Version: 2.0.14

Please let me know what i am doing wrong and how to correct this error .

Thanks Regards

 Piyush Joshi