title: Cannot open Xcode project after updating to Catalina
body: <p>I've downloaded an Open Source Xcode project from GitHub, but I can't open it with Xcode ver 10 or ver 11 beta after updating my Mac to Catalina. I don’t have any problem making a new project though. I've already restarted my Mac few times but there’s no change.</p>
  
  <p>I want some advice.</p>
  
  <p><a href="https://i.stack.imgur.com/gbez5.png" rel="noreferrer"><img src="https://i.stack.imgur.com/gbez5.png" alt="enter image description here"></a></p>