Fatal error: Uncaught Error: Class 'Symfony\Component\HttpFoundation\Session\Storage\MockArraySessionStorage' not found in /home/soh-works/www/websoket-sample/vendor/symfony/http-foundation/Session/Storage/MockFileSessionStorage.php:25 Stack trace: #0 {main} thrown in /home/soh-works/www/websoket-sample/vendor/symfony/http-foundation/Session/Storage/MockFileSessionStorage.php on line 25