PHP is working

Fatal error: Uncaught mysqli_sql_exception: Access denied for user 'batahcem_root'@'localhost' (using password: YES) in /home/batahcem/public_html/includes/db.php:13 Stack trace: #0 /home/batahcem/public_html/includes/db.php(13): mysqli->__construct() #1 /home/batahcem/public_html/index.php(3): require_once('/home/batahcem/...') #2 {main} thrown in /home/batahcem/public_html/includes/db.php on line 13