Fatal error: Uncaught Error: Class 'Symfony\Component\Serializer\Mapping\Loader\FileLoader' not found in C:\SistemasPHP\observatorio4\vendor\symfony\serializer\Mapping\Loader\XmlFileLoader.php:25 Stack trace: #0 {main} thrown in C:\SistemasPHP\observatorio4\vendor\symfony\serializer\Mapping\Loader\XmlFileLoader.php on line 25