Fatal error: Uncaught Error: Class "Ratchet\AbstractConnectionDecorator" not found in /var/www/html/lib/Ratchet/src/Ratchet/Wamp/WampConnection.php:12 Stack trace: #0 {main} thrown in /var/www/html/lib/Ratchet/src/Ratchet/Wamp/WampConnection.php on line 12