title: "Cannot Preview in this file - Failed to launch [App Name]"
body: <p>I am trying to play around with swiftUI in Xcode 11 and macOS Catalina.
  BUT
  After creating a new Project, there is a boiler plate code with a Text that says hello World. I want to have a live preview of this simple welcome message in the canvas by the side of the code.</p>
  
  <p>When i hit the resume button : 
  It says : </p>
  
  <blockquote>
    <p>Cannot Preview in this file - Failed to launch [App Name]</p>
  </blockquote>
  
  <p>I've tried hitting the diagnostic button that generated a report to send it to APPLE saying:</p>
  
  <blockquote>
    <p>[FailedToLaunchError(url:
    file:///Users/naive/Library/Developer/Xcode/DerivedData/first_swiftUI-dymizjogcbtouhclgjhhefagmcqo/Build/Intermediates.noindex/Previews/first_swiftUI/Products/Debug-iphoneos/first_swiftUI.app,
    underlying: Error Domain=NSOSStatusErrorDomain Code=-10661 "(null)"
    UserInfo={_LSLine=3554, _LSFunction=_LSOpenStuffCallLocal},
    failureCategory: UVFoundation.FailureCategory.infrastructureFailure) ]</p>
  </blockquote>
  
  <p>Here's the code, It is the default code that comes with new project created with Xcode 11 and SwiftUI option checked:</p>
  
  <pre><code>import SwiftUI
  
  struct ContentView : View {
      var body: some View {
          Text("Hello World")
      }
  }
  
  #if DEBUG
  struct ContentView_Previews : PreviewProvider {
      static var previews: some View {
          ContentView()
      }
  }
  #endif
  </code></pre>
  
  <p>I expect the canvas to show up and display live preview of my code.
  The canvas is not showing up !!</p>
  
  <p>There are two warning messages generated :</p>
  
  <blockquote>
    <p>:0: warning: imported declaration
    'UITableViewDiffableDataSourceCellProvider' could not be mapped to
    'UITableViewDiffableDataSourceReference.CellProvider'</p>
    
    <p>:0: warning: imported declaration
    'UICollectionViewDiffableDataSourceCellProvider' could not be mapped
    to 'UICollectionViewDiffableDataSourceReference.CellProvider'</p>
  </blockquote>
  
  <p>other than that, 
  My iPad 11"with iPadOS beta runs the app,
  The simulator is working as well</p>