Fatal error: Uncaught Error: Interface 'Symfony\Component\HttpFoundation\Session\Attribute\AttributeBagInterface' not found in /home/soh-works/www/websoket-sample/vendor/symfony/http-foundation/Session/Attribute/AttributeBag.php:17 Stack trace: #0 {main} thrown in /home/soh-works/www/websoket-sample/vendor/symfony/http-foundation/Session/Attribute/AttributeBag.php on line 17