title: How to fix warning "CoreUI: RunTimeThemeRefForBundleIdentifierAndName() couldn't find Assets.car in bundle with identifier: '(null)'"?
body: <p>I am trying to test app on the iOS 13 beta. When I tap a button on my welcome screen to segue to another screen the app freezes and then terminates. When I debug in Xcode 11 I see following warning lines in the console:</p>
  <blockquote>
  <p>[framework] CoreUI: RunTimeThemeRefForBundleIdentifierAndName() couldn't find Assets.car in bundle with identifier: '(null)'</p>
  <p>[framework] CoreUI: RunTimeThemeRefForBundleIdentifierAndName() couldn't find Assets.car in bundle with identifier: '(null)'</p>
  </blockquote>
  <p>and then after several seconds app terminates with log entry:</p>
  <blockquote>
  <p>Message from debugger: Terminated due to memory issue</p>
  </blockquote>
  <p>On iOS 12 there is no such problem. I created a simple test app with several assets files and the segue on the button tap worked fine. Also I changed the target version to iOS 13, changed the bundle identifier, cleaned and rebuilt, but the problem still occurs.</p>