undefined is not an object (evaluating '_reactNativeNavigation.default.push') - react-native

Question

I just updated RNN to version 2 and I'm stuck with my first push
I get an error :
undefined is not an object (evaluating '_reactNativeNavigation.default.push')
other answers on stack overflow didn't help me much so far
I guess my issue is related to this.props.componentId but I couldn't find any help in the official doc as well.
or perhaps it's coming from a wrong call to the stack since I never use the id property set in App.js
I'm also wondering if I have to provide an id manually for each screen or, as it is said in the doc it will be done automatically by RNN
if someone can guide me, I'm a bit lost -_-
my code :
App.js
import { Navigation } from 'react-native-navigation';
import { Provider } from 'react-redux';
import LandingScreen from './src/screens/Landing/Landing';
import AuthScreen from './src/screens/Auth/Auth';
import configureStore from './src/store/configureStore';
import strings from './src/global/strings';
const store = configureStore();
// Landing
Navigation.registerComponentWithRedux(strings.screens.screenLanding, () => LandingScreen, Provider, store);
// Auth
Navigation.registerComponentWithRedux(strings.screens.screenAuth, () => AuthScreen, Provider, store);
// Start App
Navigation.events().registerAppLaunchedListener(() => {
Navigation.setRoot({
root: {
stack:{
id:"appStack",
children: [
{
component: {
name: strings.screens.screenLanding,
options: {
topBar:{
title:{
text:"Welcome"
}
}
}
}
}
]
},
}
});
});
Landing.js
import React, { Component } from 'react';
import { View, Button } from 'react-native';
import Navigation from 'react-native-navigation';
import strings from '../../global/strings';
class Landing extends Component {
goToScreen = (screenName) => {
Navigation.push(this.props.componentId, {
component: {
name: screenName
}
})
}
render() {
return (
<View>
<Button
title="Connexion"
onPress={() => this.goToScreen(strings.screens.screenAuth.toString())}
/>
</View>
)
}
}
export default Landing;

Answer 1

as indicated by jinshin1013 in RNN issue tracker In Landing.js,
I should have import Navigation like this :
import { Navigation } from 'react-native-navigation