Fatal error: Uncaught Error: Class 'Symfony\Component\Serializer\Exception\UnexpectedValueException' not found in C:\SistemasPHP\observatorio4\vendor\symfony\serializer\Exception\NotEncodableValueException.php:17 Stack trace: #0 {main} thrown in C:\SistemasPHP\observatorio4\vendor\symfony\serializer\Exception\NotEncodableValueException.php on line 17