Im learning notification centers right now and am getting this error while trying to register an observer:
`Cannot convert value of type 'Selector' to expected argument type 'String'`

My observer code: 

```
NotificationCenter.addObserver(self, forKeyPath: #selector(receivedMsg), options: Notification.Name("NC1"), context: nil)

```

Function receivedMsg:

```
 @objc func receivedMsg() {
print("MSG Received")
}

```

Working off this tutorial: <https://www.hackingwithswift.com/example-code/system/how-to-post-messages-using-notificationcenter>

Why am I getting this error and what can I do to fix it?
(Swift 4.2)