Fatal error: Uncaught Error: Interface "Ratchet\RFC6455\Handshake\NegotiatorInterface" not found in /home/defenders/public_html/0255_projects/vaste/vendor/ratchet/rfc6455/src/Handshake/ServerNegotiator.php:12 Stack trace: #0 {main} thrown in /home/defenders/public_html/0255_projects/vaste/vendor/ratchet/rfc6455/src/Handshake/ServerNegotiator.php on line 12