Fatal error: Uncaught Error: Trait "Symfony\Component\Serializer\Mapping\Factory\ClassResolverTrait" not found in /home/rosengar/www-craft/craft-rosengart/vendor/symfony/serializer/Mapping/Factory/ClassMetadataFactory.php:23 Stack trace: #0 {main} thrown in /home/rosengar/www-craft/craft-rosengart/vendor/symfony/serializer/Mapping/Factory/ClassMetadataFactory.php on line 23