Fatal error: Uncaught Error: Interface 'Ratchet\Session\Serialize\HandlerInterface' not found in /var/www/html/stz-api/vendor/cboden/ratchet/src/Ratchet/Session/Serialize/PhpBinaryHandler.php:4 Stack trace: #0 {main} thrown in /var/www/html/stz-api/vendor/cboden/ratchet/src/Ratchet/Session/Serialize/PhpBinaryHandler.php on line 4