Fatal error: Uncaught Error: Class 'PHPSocketIO\Engine\Transport' not found in /var/www/html/vendor/workerman/phpsocket.io/src/Engine/Transports/Polling.php:6 Stack trace: #0 {main} thrown in /var/www/html/vendor/workerman/phpsocket.io/src/Engine/Transports/Polling.php on line 6