TypeError: Cannot read property 'createNotificationChannel' of undefined

I am working with the example project from this repo. And I have a problem to access FCM.

```
async componentDidMount() {
console.log(FCM) //<-- i added this for debugging.
FCM.createNotificationChannel({
id: 'default',
name: 'Default',
description: 'used for example',
priority: 'high'
})
```

And this is very weird. Because the console.log clearly shows that the FCM object is there.
But then there is this error and execution of the componentDidMount ends.


"react": "16.4.1",
"react-native": "0.56.0",
"react-native-fcm": "^16.1.0",
"react-native-firebase": "5.0.0-rc0",

Android 8.1 Simulator

The same code is working on ios like a charm. Maybe this is linked to my other issue?
https://github.com/evollu/react-native-fcm/issues/1026