Fatal error: Uncaught ArgumentCountError: mysqli_select_db() expects exactly 2 arguments, 1 given in C:\xampp\htdocs\gw\config.php:9 Stack trace: #0 C:\xampp\htdocs\gw\config.php(9): mysqli_select_db('grading') #1 C:\xampp\htdocs\gw\index.php(2): include('C:\\xampp\\htdocs...') #2 {main} thrown...