Fatal error: Uncaught Error: Interface 'Psr\Http\Message\StreamInterface' not found in /home/soh-works/www/websoket-sample/vendor/guzzlehttp/psr7/src/AppendStream.php:14 Stack trace: #0 {main} thrown in /home/soh-works/www/websoket-sample/vendor/guzzlehttp/psr7/src/AppendStream.php on line 14