title: 'Gradle sync failed' on android studio after ejecting from React Native
body: <p>I created an app with React Native expo (expo init my-project)</p>
  
  <p>However, when I ran npm run eject, there are errors when I open it out on Android Studio. </p>
  
  <blockquote>
    <p>Gradle sync failed: Java or Kotlin file
    /Users/rachelchng/Desktop/rn/expo/decisionFatigue/android/app/src/main/java/my-project/MainApplication.java
    does not include package declaration
                  Consult IDE log for more details (Help | Show Log) (9 s 805 ms)</p>
  </blockquote>
  
  <p>please advise, thanks!</p>