Fatal error: Uncaught Error: Class 'Illuminate\Database\Connection' not found in C:\xampp\htdocs\admin\vendor\laravel\framework\src\Illuminate\Database\MySqlConnection.php:16 Stack trace: #0 {main} thrown in C:\xampp\htdocs\admin\vendor\laravel\framework\src\Illuminate\Database\MySqlConnection.php on line 16