title: React Native (Android) - cannot find symbol class ReactInstanceManager
body: <p>I just upgraded to React Native <code>0.63.3</code>.....I also upgraded Android studio to <code>4.1.1</code> and gradle plugin to <code>4.1.0</code>.<br>
  Im getting the error <code>cannot find symbol class ReactInstanceManager</code> when I try to build.<br><br>The error is in file <code>MainApplication.java</code>.....see code below.
  <br>Appears the error is with the line <code>initializeFlipper(this,getReactNativeHost().getReactInstanceManager());</code>.
  It seems to be saying that Im providing <code>com.facebook.react.ReactInstanceManager</code>....but what the program wants is <code>ReactInstanceManager</code>.  <br>It says <code>Get the current ReactInstanceManager instance, or create one.</code></p>
  <pre><code>  @Override
    public void onCreate() {
      super.onCreate();
      SoLoader.init(this, /* native exopackage */ false);
      initializeFlipper(this, getReactNativeHost().getReactInstanceManager());
    }
  
    /**
     * Loads Flipper in React Native templates. Call this in the onCreate method with something like
     * initializeFlipper(this, getReactNativeHost().getReactInstanceManager());
     *
     * @param context
     * @param reactInstanceManager
     */
    private static void initializeFlipper(
        Context context, ReactInstanceManager reactInstanceManager) {
      if (BuildConfig.DEBUG) {
        try {
          /*
           * We use reflection here to pick up the class that initializes Flipper, since
           * Flipper library is not available in release mode
           */
          Class&lt;?&gt; aClass = Class.forName(&quot;com.xs.ReactNativeFlipper&quot;);
          aClass
              .getMethod(&quot;initializeFlipper&quot;, Context.class, ReactInstanceManager.class)
              .invoke(null, context, reactInstanceManager);
        } catch (ClassNotFoundException e) {
  </code></pre>