Fatal error: Uncaught Error: Class 'Symfony\Component\Validator\Mapping\Loader\FilesLoader' not found in C:\xampp\htdocs\plugins\Symfony\Component\Validator\Mapping\Loader\YamlFilesLoader.php:22 Stack trace: #0 {main} thrown in C:\xampp\htdocs\plugins\Symfony\Component\Validator\Mapping\Loader\YamlFilesLoader.php on line 22