title: Xcode - error: unable to open executable.....how to fix?
body: <p>my first iPhone app is ready for submission using the Application Uploader. I think I understand that I have to create the file by going <em>Product : Archive</em> in Xcode, but when I do I get this message: </p>
  
  <blockquote>
    <p>error: unable to open executable
    '/Users/Library/Developer/Xcode/DerivedData/test-euevazxsqeehnwantvxjhqwkytxr/ArchiveIntermediates/test/InstallationBuildProductsLocation/Applications/test.app/test'</p>
  </blockquote>
  
  <p>The app builds and runs fine on my phone and on the simulator, so please can I have some advice on how to fix this? Thank you.</p>