Laravel 5.4 pusher error

Asked by: jeetender sharma

I am using pusher in Laravel 5.4 but I'm getting following error:

WebSocket connection to 'ws://ws.pusherapp.com/app/731e32c5f123456298e?protocol=7&client=js&version=4.1.0&flash=false' failed: WebSocket is closed before the connection is established.

Pusher : Error : {"type":"WebSocketError","error":{"type":"PusherError","data":{"code":4001,"message":"Did you forget to specify the cluster when creating the Pusher instance? App key 731e32c5f123456298e does not exist in this cluster."}}}

Source