Fatal error: Uncaught Error: Interface "Symfony\Component\Serializer\Mapping\Loader\LoaderInterface" not found in /home/rosengar/www-craft/craft-rosengart/__ex__20260509/_ex_vendor/symfony/serializer/Mapping/Loader/FileLoader.php:21 Stack trace: #0 {main} thrown in /home/rosengar/www-craft/craft-rosengart/__ex__20260509/_ex_vendor/symfony/serializer/Mapping/Loader/FileLoader.php on line 21