Fatal error: Uncaught mysqli_sql_exception: Access denied for user 'root'@'localhost' in /var/www/html/db.php:8 Stack trace: #0 /var/www/html/db.php(8): mysqli->__construct() #1 /var/www/html/login.php(13): require_once('...') #2 {main} thrown in /var/www/html/db.php on line 8