Fatal error: Uncaught Error: Class 'League\Config\Exception\InvalidConfigurationException' not found in D:\xampp\htdocs\psp\backend\vendor\league\config\src\Exception\ValidationException.php:18 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\league\config\src\Exception\ValidationException.php on line 18