title: Xcode: issue "file xxx.png is missing from working copy" at project building
body: <p>After deleting/adding some png files to project, i have got messages when building project.</p>
  
  <p>"file ProjectPath\aaa\xxx.png is missing from working copy."</p>
  
  <p>All these files are in the project, and the application is running. However, these messages are annoying. Looked .plist file, but there is no mention of these files.
  What should I do to remove these messages?</p>