Problem with database!

PDOException: SQLSTATE[HY000] [1045] Access denied for user 'kevin'@'localhost' (using password: YES) in /var/www/html/wordpress/APIS/TiropitLauncher/Skins/class/database.php:8
Stack trace:
#0 /var/www/html/wordpress/APIS/TiropitLauncher/Skins/class/database.php(8): PDO->__construct()
#1 /var/www/html/wordpress/APIS/TiropitLauncher/Skins/index.php(7): DataBase->__construct()
#2 {main}