title: cannot find symbol MainReactPackage
body: <p>I have ejected my react native app to Expokit. I am trying to use <a href="https://github.com/invertase/react-native-firebase" rel="nofollow noreferrer">react native firebase</a>. After following the setup instructions for react native firebase as given on <a href="https://invertase.io/react-native-firebase/#/installation-android" rel="nofollow noreferrer">android installation page</a>, when I execute 'react-native run-android' I get an error:</p>
  
  <pre><code>MainApplication.java:37: error: cannot find symbol
  new MainReactPackage(),
      ^
  symbol: class MainReactPackage
  location: class MainApplication
  </code></pre>
  
  <p>The MainApplication.java looks like this:</p>
  
  <pre><code>package com.abc.xyz;
  
  import android.support.multidex.MultiDexApplication;
  
  import com.facebook.react.ReactPackage;
  
  import java.util.Arrays;
  import java.util.List;
  
  import io.invertase.firebase.RNFirebasePackage; 
  import io.invertase.firebase.analytics.RNFirebaseAnalyticsPackage; // Firebase Analytics
  import com.facebook.react.ReactApplication;
  
  public class MainApplication extends MultiDexApplication {
  
    public List&lt;ReactPackage&gt; getPackages() {
      return Arrays.&lt;ReactPackage&gt;asList(
            new MainReactPackage(),
            new RNFirebasePackage(),  
            new RNFirebaseAnalyticsPackage()
      );
    }
  }
  </code></pre>