Fatal error: Uncaught Error: Interface 'Psr\Http\Message\MessageInterface' not found in /home/soh-works/www/websoket-sample/vendor/psr/http-message/src/ResponseInterface.php:20 Stack trace: #0 {main} thrown in /home/soh-works/www/websoket-sample/vendor/psr/http-message/src/ResponseInterface.php on line 20