Problem When in use NavigationBar

[nontachaiwebdev]

Hi i have a problem when use this code.
<NavigationExperimental.Navigator ref='main' initialRoute={routes[0]} renderScene={this.renderScene.bind(this)} navigationBar={ <NavigationExperimental.Navigator.NavigationBar navigationStyles={NavigationExperimental.Navigator.NavigationBarStylesIOS} ...

I have a error is " Cannot read property 'NavigationBar' of undefined "

I think i use this repo in wrong way but now am not have any idea for fix it.

Thankyou