Warning: mysqli::__construct(): (HY000/1045): Access denied for user 'root'@'localhost' (using password: NO) in C:\xampp\htdocs\library\core\SingletonMysqli.class.php on line 0

Warning: mysqli::query(): Couldn't fetch mysqli in C:\xampp\htdocs\library\core\SingletonMysqli.class.php on line 0

Fatal error: Database Connection Error: 1045: Access denied for user 'root'@'localhost' (using password: NO) in C:\xampp\htdocs\library\core\Database.class.php on line 0