title: module appregistry is not a registered callable module (calling runApplication)
body: <p>i cannot find a way to make react-navigation work at all. i copied the working examples from the internet but they don't seem to work too. can someone tell me what i am doing wrong.</p>
  
  <p>i'm using 
      node: 8.9.4
      react: 16.3.0-alpha.1
      react-native: 0.54.0
      react-navigation: ^1.4.0</p>
  
  <pre><code>//index.js
  import React, { Component } from 'react';
  import {
    AppRegistry,
    StyleSheet,
    Text,
    View
  } from 'react-native';
  import {
    TabNavigator,
    StackNavigator
  } from 'react-navigation';
  
  import Home from './first';
  import Homes from './second';
  
  export default class demoApp extends Component {
    render() {
      return (
        &lt;SimpleNavigation/&gt;
      );
    }
  }
  
  export const SimpleNavigation = StackNavigator({
    Home: { 
      screen: Home,
      header: { visible: false },
      navigationOptions: {
        title: 'Home',
        header: null
      },
    },
    Homes: { 
      screen: Homes,
      navigationOptions: {
        title: 'second'
      },
    },
  },{});
  </code></pre>
  
  <p>Here's the first tab</p>
  
  <pre><code>//first.js
  import React, { Component } from 'react';
  import {
    AppRegistry,
    StyleSheet,
    Text,
    View,
    Image,
    TextInput,
    Button,
    TouchableHighlight
  } from 'react-native';
  
  export default class Home extends Component {
      constructor(props){
          super(props);
          this.state = {zipCode: ''}
      }
      navigate = (zipCode) =&gt; {
          this.props.navigation.navigate('Search', zipCode);
      }
      render() {
          return (
              &lt;View&gt;
                  &lt;View&gt;
                      &lt;Text&gt;An application to do things&lt;/Text&gt;
                      &lt;TextInput 
  
                          placeholder='Enter a Zip Code' 
                          onChangeText={(zipCode) =&gt; this.setState({zipCode})}
                          &gt;
                      &lt;/TextInput&gt;
                  &lt;/View&gt;
                  &lt;View&gt;
                      &lt;TouchableHighlight onPress={() =&gt; this.navigate(this.state.zipCode)}&gt;
                          &lt;Text&gt;
                              Search
                          &lt;/Text&gt;
                      &lt;/TouchableHighlight&gt;
                  &lt;/View&gt;
              &lt;/View&gt;
          );
      }
  }
  </code></pre>
  
  <p>i cant seem to make it run at all. I tried following many other tutorials as well. But none of them worked. What am i doing wrong?</p>