Fatal error: Uncaught mysqli_sql_exception: Access denied for user 'root'@'localhost' (using password: YES) in /home/mangt/public/research/class_lib/database.php:11 Stack trace: #0 /home/mangt/public/research/class_lib/database.php(11): mysqli->__construct() #1 /home/mangt/public/research/index.php(6): Database->__construct() #2 {main} thrown in /home/mangt/public/research/class_lib/database.php on line 11