title: Heroku App Succeed but NOT Succeed to Deploy
body: <p>I think I've succeeded to deploy my react app to Heroku according to this <a href="https://i.stack.imgur.com/1Bi1Z.jpg" rel="nofollow noreferrer">picture</a>, but somehow when I open the app it just shows a "Not Found" text and an error message </p>
  
  <blockquote>
    <p>"Failed to load resource: the server responded with a status of 404 (Not Found)" on the console.</p>
  </blockquote>
  
  <p><img src="https://i.stack.imgur.com/1Bi1Z.jpg" alt=""></p>
  
  <p>What does that means? What should I do?</p>