Fatal error: Uncaught Error: Interface 'Evenement\EventEmitterInterface' not found in /var/www/html/ng-crm/yiiapp/vendor/ratchet/pawl/src/WebSocket.php:14 Stack trace: #0 {main} thrown in /var/www/html/ng-crm/yiiapp/vendor/ratchet/pawl/src/WebSocket.php on line 14