title: How to solve a "duplicate items" error in the "Resources" parameter
body: <p>While working on my project, I got this error:</p>
  
  <blockquote>
    <p>The item "..." was specified more than once in the "Resources" parameter.  Duplicate items are not supported by the "Resources" parameter.</p>
  </blockquote>
  
  <p>(Removed the item's name, doesn't matter)</p>
  
  <p>However, I do not know how to solve this. Where do I find this parameter in Visual C# Express?</p>