Fatal error: Uncaught Error: Interface 'Symfony\Component\Serializer\Encoder\DecoderInterface' not found in C:\SistemasPHP\observatorio4\vendor\symfony\serializer\Encoder\JsonDecode.php:21 Stack trace: #0 {main} thrown in C:\SistemasPHP\observatorio4\vendor\symfony\serializer\Encoder\JsonDecode.php on line 21