title: Trying to build a VS2010 csproj from command prompt
body: <p>The error I get is:</p>
  
  <blockquote>
    <p>c:\windows\microsoft.net\framework\v4.0.30319\microsoft.csharp.targets(132,9) : error MSB4066: The attribute "Returns" in element  is unrecognized.</p>
  </blockquote>
  
  <p>Does anyone have any idea how to resolve this issue?</p>