The PDO extension is a database driver that connects to the MySQL database from PHP scripts. Contact the server admin to enable PDO support for the server PHP. For more information on PDO, please visit the official PDO documentation on PHP.net. After enabling the PDO extension, refresh the page and try gain.
As an alternative to PDO, the PHP Live! system does include MySQL or MySQLi connector methods. You will need to update the config file to set the MySQL connecting type. The following documentation will detail the procedures to update the MySQL connecting type: