Fatal error: Uncaught Error: Interface "Symfony\Component\HttpFoundation\Session\Flash\FlashBagInterface" not found in /srv/www/sites/public/starter-cms/vendor/symfony/http-foundation/Session/Flash/AutoExpireFlashBag.php:19 Stack trace: #0 {main} thrown in /srv/www/sites/public/starter-cms/vendor/symfony/http-foundation/Session/Flash/AutoExpireFlashBag.php on line 19