Problem with database!

PDOException: SQLSTATE[HY000] [1045] Access denied for user ''@'localhost' (using password: NO) in /home/forge/skiny.kill4u.pl/public/class/database.php:8
Stack trace:
#0 /home/forge/skiny.kill4u.pl/public/class/database.php(8): PDO->__construct()
#1 /home/forge/skiny.kill4u.pl/public/index.php(7): DataBase->__construct()
#2 {main}