title: Issue when using Xcode 11 running Canvas on macOS Catalina
body: <p>I have Catalina macOS version (10.15) installed and still the canvas is not showing up. </p>
  
  <p>The error message I get from Xcode is</p>
  
  <blockquote>
    <p>Select a scheme that builds a target which contains the current file,
    or add this file to a target that is built by the current scheme</p>
  </blockquote>