Fatal error: Uncaught Error: Class "ElephantIO\Parser\Websocket\Payload" not found in /var/www/html/server/vendor/elephantio/elephant.io/src/Parser/Websocket/Decoder.php:24 Stack trace: #0 {main} thrown in /var/www/html/server/vendor/elephantio/elephant.io/src/Parser/Websocket/Decoder.php on line 24