title: SwiftUI - Preview canvas gives Coordinated install error
body: <p>I am trying to run the Landmark sample for the SwiftUI, but getting following error</p>
  
  <blockquote>
    <p>Error Domain=IXErrorDomain Code=29 "A coordinated install for com.example.apple-samplecode.Landmarks is already pending." UserInfo={NSLocalizedFailureReason=Unhandled reason for code: 29 in domain IXErrorDomain, FunctionName=+[IXAppInstallCoordinator(IXSimpleInstaller) _beginInstallForURL:consumeSource:options:completion:]_block_invoke, SourceFileLine=143, NSLocalizedDescription=A coordinated install for com.example.apple-samplecode.Landmarks is already pending.}</p>
  </blockquote>
  
  <p>Enviorment: Catalina Beta + Xcode Beta </p>