Warning: mysqli_connect(): (HY000/1045): Access denied for user 'xettuyen'@'localhost' (using password: YES) in /var/www/html/xettuyen/mvc/core/DB.php on line 16

Fatal error: Uncaught TypeError: mysqli_select_db(): Argument #1 ($mysql) must be of type mysqli, bool given in /var/www/html/xettuyen/mvc/core/DB.php:17 Stack trace: #0 /var/www/html/xettuyen/mvc/core/DB.php(17): mysqli_select_db() #1 /var/www/html/xettuyen/mvc/core/Controller.php(9): DB->__construct() #2 /var/www/html/xettuyen/mvc/controllers/selectpage.php(7): Controller->model() #3 /var/www/html/xettuyen/mvc/core/App.php(26): selectpage->__construct() #4 /var/www/html/xettuyen/index.php(7): App->__construct() #5 {main} thrown in /var/www/html/xettuyen/mvc/core/DB.php on line 17