Fatal error: Uncaught Error: Interface 'Symfony\Component\HttpFoundation\Session\Flash\FlashBagInterface' not found in /home/www/farandole/vendor/symfony/http-foundation/Symfony/Component/HttpFoundation/Session/Flash/FlashBag.php:21 Stack trace: #0 {main} thrown in /home/www/farandole/vendor/symfony/http-foundation/Symfony/Component/HttpFoundation/Session/Flash/FlashBag.php on line 21