Super expression must either be null or a function, not undefined

[Frexuz]

Version

Tell us which versions you are using:

• react-native-router-flux v4.0.0-beta.21
• react-native v0.45.1

Expected behaviour

Running the app successfully.

Actual behaviour

Using Tabs isn't working for me. Removing it works fine!

class AppRouter extends Component {
  render () {
    return (
      <Router
        createReducer={reducerCreate}>
        <Modal hideNavBar>
          <Scene hideNavBar>
            <Tabs
              key='tabbar'
              showLabel
              swipeEnabled={false}
              tabBarPosition='bottom'
              lazy>
              <Stack
                key='HomeStack'
                title='Home'
                icon={TabIcon}
                initial >
                <Scene
                  key='Profile'
                  hideNavBar
                  component={UserHistoryList}
                />
              </Stack>
            </Tabs>
          </Scene>
       </Modal>
      </Router>
    )
  }
}

Steps to reproduce

• Strangely, the Example app works for me.

• Another developer can run our repo fine.

• I've tried rm -r node_modules, npm start --reset-cache and yarn install

I understand since its not easily reproducible, you don't have much to go on.

[aksonov]

Probably you have to use atleast two tabs for TabBar.