Invalid key in subscription auth data: 'INSERT_YOUR_KEY_HERE'"

[KumailHussain]

I am receiving this error even i pasted the key from pusher dashboard:
Pusher : Error : {"type":"WebSocketError","error":{"type":"PusherError","data":{"code":null,"message":"Invalid key in subscription auth data: 'INSERT_YOUR_KEY_HERE'"}}}
warn @ pusher.min.js:8
(anonymous) @ pusher.min.js:8
t.emit @ pusher.min.js:8
error @ pusher.min.js:9
t.emit @ pusher.min.js:8
message @ pusher.min.js:9
t.emit @ pusher.min.js:8
e.onMessage @ pusher.min.js:8
socket.onmessage @ pusher.min.js:8
t.onEvent @ pusher.min.js:9
t.onChunk @ pusher.min.js:9
(anonymous) @ pusher.min.js:9
t.emit @ pusher.min.js:8
e.onChunk @ pusher.min.js:8
n.onreadystatechange.n.onprogress @ pusher.min.js:9
i used javascript key can you suggest me what I am doing wrong even i enable
Enable client events from settings