React navigation navigation.getChildNavigation is not a fucntion

I am in the prosess of updating from React navigation v1 to v4. In v1 we used react-navigation-redux-helpers for connecting the state. Now I have done this much so far.

In my Navigation.js I have this

let AppNavContainer = MainStack;

export default AppNavContainer;

const initialState = AppNavContainer.router.getStateForAction(
  NavigationActions.init()
);

export const navReducer = (state = initialState, action) => {
  const nextState = AppNavContainer.router.getStateForAction(action, state);
  updateFocus(nextState);
  if (action.type === "Navigation/NAVIGATE" && action.routeName !== "PinCode") {
    Keyboard.dismiss();
  }
  // Simply return the original `state` if `nextState` is null or undefined.
  return nextState || state;
};

Then in my store I am doing this

const middleware = createReactNavigationReduxMiddleware(
  "root",
  (state) => state.nav
);

const /** ***********  MIDDLEWARES ************/
    middleWares = [
    effectsMiddleware(EffectsList),
    middleware,
];

const store = createStore(
  combineReducers({
    appData: combineReducers(storeShape),
    nav: navReducer,
    appState: AppReducer, // MUST BE LAST!
  }),
  applyMiddleware(...middleWares)
);

Then in my App.js I am doing this

render() {
  <SafeAreaView style={styles.container}>
      <AppNavContainer
        navigation={({
          dispatch: this.props.dispatch,
          state: this.props.nav,
          addListener,
        })}
      />
</SafeAreaView>
}

const addListener = createReduxBoundAddListener("root");

static mapStateToProps(state) {
    return {
      nav: state.nav
    };
}

After doing all this I am getting this error

navigation.getChildNavigation is not a function

Here are my packages version

"react-navigation-redux-helpers": "^2.0.8",
"react-navigation-stack": "^2.8.2",
"react-navigation-tabs": "^2.9.0",
"react-navigation": "^4.4.0",
"react": "^16.8.3",
"react-native": "^0.59.10",

Am I missing something?

react-navigation / redux-helpers

React navigation navigation.getChildNavigation is not a fucntion #110