title: Xcode Archive made an empty Products folder : Validate Content Button is grayed
body: <p>I'm trying to build an archive file for my first IOS app uploading with Xcode.
  But after archiving, the Validate Content button is grayed.
  Like this:</p>
  
  <p><img src="https://i.stack.imgur.com/1o0bo.png" alt="My archive file is grouped as Generic Xcode Archive"></p>
  
  <p>I think that's because the Products folder, which XCode made in the app archive package( .xcarchive file ), is empty.</p>
  
  <p><img src="https://i.stack.imgur.com/5dHQe.png" alt="My Products folder is empty"></p>
  
  <pre><code>My Xcode is ver. 11.4.1
  And CocoaPods is ver 1.9.1
  </code></pre>
  
  <p>As an experiment, I made a new project and that archiving went well.
  So Maybe something wrong with my main app.</p>
  
  <p>Any idea what I'm doing wrong?</p>