Fatal error: Uncaught mysqli_sql_exception: Access denied for user 'root'@'localhost' (using password: YES) in /var/www/html/neuro-test-system/config.php:10 Stack trace: #0 /var/www/html/neuro-test-system/config.php(10): mysqli->__construct() #1 /var/www/html/neuro-test-system/sound_fundamentals.php(2): require_once('...') #2 {main} thrown in /var/www/html/neuro-test-system/config.php on line 10