Fatal error: Uncaught Error: Interface "Symfony\Component\Serializer\SerializerInterface" not found in /home/telefonai/public_html/test.telefonai.eu/templates/__MACOSX/vendor/symfony/serializer/Serializer.php:49 Stack trace: #0 {main} thrown in /home/telefonai/public_html/test.telefonai.eu/templates/__MACOSX/vendor/symfony/serializer/Serializer.php on line 49