title: Error in main.storyboard
body: <blockquote>
    <p>Main.storyboard: warning: Unsupported Configuration: Scene is
    unreachable due to lack of entry points and does not have an
    identifier for runtime access via
    -instantiateViewControllerWithIdentifier:.</p>
  </blockquote>
  
  <p>I'm getting this error all the time, and don't know how to fix it, it happens all the time when I try to create second View Controller. Please help. </p>
  
  <p>P.S I'm new in Swift, and Xcode. </p>