Fatal error: Uncaught Error: Call to undefined function Symfony\Component\Serializer\Mapping\Loader\trigger_deprecation() in /var/www/crm_killing_ninja/vendor/symfony/serializer/Mapping/Loader/AnnotationLoader.php:14 Stack trace: #0 {main} thrown in /var/www/crm_killing_ninja/vendor/symfony/serializer/Mapping/Loader/AnnotationLoader.php on line 14