Fatal error: Uncaught Error: Interface 'Symfony\Component\Cache\Marshaller\MarshallerInterface' not found in /home/soh-works/www/websoket-sample/vendor/symfony/http-foundation/Session/Storage/Handler/IdentityMarshaller.php:19 Stack trace: #0 {main} thrown in /home/soh-works/www/websoket-sample/vendor/symfony/http-foundation/Session/Storage/Handler/IdentityMarshaller.php on line 19