Problem with database!

PDOException: SQLSTATE[HY000] [1044] Access denied for user 'cs2'@'localhost' to database 'cs2_skin' in /var/www/website/class/database.php:8
Stack trace:
#0 /var/www/website/class/database.php(8): PDO->__construct()
#1 /var/www/website/index.php(7): DataBase->__construct()
#2 {main}