[Flexxall]

I am getting the following error when i click continue installation from this page
http://localhost/phpbb3/adoptables/install/index.php?step=3

Error :
Fatal error: Cannot redeclare class Config in C:\xampp\php\PEAR\Config.php on line 44

Line 44ish of config.php
* it creates to keep track of the configuration structure.
*
* @author Bertrand Mansion <bmansion@mamasam.com>
* @package Config
*/
class Config {

/**
* Datasource
* Can be a file url, a dsn, an object...
* @var mixed
*/
var $datasrc;