Fatal error: Uncaught Error: Interface 'Symfony\Component\Serializer\Normalizer\NormalizableInterface' not found in /home/almasai/www/people/_old_site/vendor/symfony/tests/Symfony/Tests/Component/Serializer/Fixtures/Dummy.php:8 Stack trace: #0 {main} thrown in /home/almasai/www/people/_old_site/vendor/symfony/tests/Symfony/Tests/Component/Serializer/Fixtures/Dummy.php on line 8