Fatal error: Uncaught Error: Call to undefined function Symfony\Component\HttpFoundation\Session\Attribute\trigger_deprecation() in /home/soh-works/www/websoket-sample/vendor/symfony/http-foundation/Session/Attribute/NamespacedAttributeBag.php:14 Stack trace: #0 {main} thrown in /home/soh-works/www/websoket-sample/vendor/symfony/http-foundation/Session/Attribute/NamespacedAttributeBag.php on line 14