Fatal error: Uncaught mysqli_sql_exception: No connection could be made because the target machine actively refused it in C:\XAMPP\htdocs\connection.php:4 Stack trace: #0 C:\XAMPP\htdocs\connection.php(4): mysqli_connect('localhost', 'root', Object(SensitiveParameterValue), 'appointment') #1 C:\XAMPP\htdocs\admin_login.php(1): include('C:\\XAMPP\\htdocs...') #2 {main} thrown in C:\XAMPP\htdocs\connection.php on line 4