Fatal error: Uncaught Error: Class "Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer" not found in /home/telefonai/public_html/test.telefonai.eu/vendor/symfony/serializer/Normalizer/PropertyNormalizer.php:40 Stack trace: #0 {main} thrown in /home/telefonai/public_html/test.telefonai.eu/vendor/symfony/serializer/Normalizer/PropertyNormalizer.php on line 40