Fatal error: Uncaught Error: Class 'Symfony\Component\Serializer\Exception\UnexpectedValueException' not found in C:\xampp\htdocs\plugins\Symfony\Component\Serializer\Exception\NotEncodableValueException.php:17 Stack trace: #0 {main} thrown in C:\xampp\htdocs\plugins\Symfony\Component\Serializer\Exception\NotEncodableValueException.php on line 17