Fatal error: Uncaught Error: Class 'Symfony\Component\Serializer\Exception\RuntimeException' not found in C:\xampp\htdocs\plugins\Symfony\Component\Serializer\Exception\MappingException.php:19 Stack trace: #0 {main} thrown in C:\xampp\htdocs\plugins\Symfony\Component\Serializer\Exception\MappingException.php on line 19