title: Duplicate items not supported keeps reappearing
body: <p>I keep getting this error below, and each time I need to delete the file specified to fix it. This happens when I use the designer.</p>
  
  <blockquote>
    <p>The item "obj\Debug\Supermarket.frmCustomer.resources" was specified
    more than once in the "Resources" parameter.  Duplicate items are not
    supported by the "Resources" parameter.   Supermarket</p>
  </blockquote>
  
  <p>Is there any permanent solution to this, as it happens to any of the form I edit using the Visual Studio designer?</p>