Fatal error: Uncaught Error: Trait "Symfony\Component\Serializer\Context\ContextBuilderTrait" not found in /home/rosengar/www-craft/craft-rosengart/vendor/symfony/serializer/Context/SerializerContextBuilder.php:22 Stack trace: #0 {main} thrown in /home/rosengar/www-craft/craft-rosengart/vendor/symfony/serializer/Context/SerializerContextBuilder.php on line 22