Fatal error: Uncaught Error: Class "Symfony\Component\Serializer\Normalizer\AbstractNormalizer" not found in /home/ramassof/backup.ramas.dev/vendor/symfony/serializer/Tests/Fixtures/AbstractNormalizerDummy.php:21 Stack trace: #0 {main} thrown in /home/ramassof/backup.ramas.dev/vendor/symfony/serializer/Tests/Fixtures/AbstractNormalizerDummy.php on line 21