title: reactNativeNavigation.Navigation.startSingleApp is not a function
body: <p>I'm building a React Native app and using React Native Navigation to move between screens.  Something happened, some files were deleted and it seems like my xcode project settings were wiped.</p>
  
  <p>When I boot up my app using 'npm run start' and 'react-native run-ios --simulator="iPhoneX", I get the following errors:</p>
  
  <ul>
  <li>red error simulator screen that says: _reactNative.Navigation.startSingleScreenApp is not a function</li>
  <li>the terminal window I ran "run-ios" fails and has this error: 
  <code>Undefined symbols for architecture x86_64:
  "_OBJC_CLASS_$_RNNCustomViewController", referenced from:
    objc-class-ref in AppDelegate.o
  ld: symbol(s) not found for architecture x86_64
  clang: error: linker command failed with exit code 1 (use -v to see invocation)</code></li>
  </ul>
  
  <p>I followed these instructions: <a href="https://wix.github.io/react-native-navigation/#/docs/Installing" rel="nofollow noreferrer">https://wix.github.io/react-native-navigation/#/docs/Installing</a></p>
  
  <p>versions:</p>
  
  <ul>
  <li>node: v11.6.0</li>
  <li>npm: 6.5.0</li>
  <li>react-native-cli: 2.0.1</li>
  <li>react-native: 0.55.3</li>
  <li>"react-native-navigation": "^2.2.5"</li>
  </ul>
  
  <p>App.js:</p>
  
  <pre class="lang-js prettyprint-override"><code>import { Navigation } from 'react-native-navigation';
  
  import AuthScreen from './src/screens/Auth/Auth';
  import SequencesList from './src/screens/SequencesList/SequencesList';
  
  Navigation.registerComponent("my-app.AuthScreen", () =&gt; AuthScreen);
  Navigation.registerComponent("my-app.App", () =&gt; App);
  Navigation.registerComponent("my-app.SequencesList", () =&gt; SequencesList);
  
  Navigation.startSingleScreenApp({
    screen: {
      screen: "my-app.SequencesList",
      title: "Sequences"
    }
  });
  </code></pre>
  
  <p>AppDelegate.m</p>
  
  <pre class="lang-m prettyprint-override"><code>#import "AppDelegate.h"
  
  #import &lt;React/RCTBundleURLProvider.h&gt;
  #import &lt;React/RCTRootView.h&gt;
  #import &lt;ReactNativeNavigation/ReactNativeNavigation.h&gt;
  
  @implementation AppDelegate
  
  - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
  {
    NSURL *jsCodeLocation = [[RCTBundleURLProvider sharedSettings] jsBundleURLForBundleRoot:@"index" fallbackResource:nil];
    [ReactNativeNavigation bootstrap:jsCodeLocation launchOptions:launchOptions];
  
    return YES;
  }
  
  @end
  </code></pre>
  
  <p>header search path has been set to: <code>$(SRCROOT)/../node_modules/react-native-navigation/lib/ios</code></p>