Squirrelmail error.

If a client gets the following error whilst trying to access SquirrelMail: 

Warning: main(../config/config.php): failed to open stream: No such file or directory in /usr/local/cpanel/base/3rdparty/squirrelmail/functions/global.php on line 18
Fatal error: main(): Failed opening required ‘../config/config.php’ (include_path=’/usr/local/cpanel/3rdparty/lib/php/:.’) in /usr/local/cpanel/base/3rdparty/squirrelmail/functions/global.php on line 18

…then follow these steps to fix the problem:

1)
Go to directory /usr/local/cpanel/base/3rdparty/squirrelmail/config

# cd /usr/local/cpanel/base/3rdparty/squirrelmail/config
2)
copy config_default.php to config.php

root@server1[/usr/local/cpanel/base/3rdparty/squirrelmail/config]# cp config_default.php config.php
 That should be the problem solved!