title: wcf serviceActivations could not be found
body: <p>Can anyone tell me about this error? </p>
  
  <blockquote>
    <p>system.serviceModel/serviceHostingEnvironment/serviceActivations
    could not be found.</p>
  </blockquote>
  
  <p>I'm trying to make WCF app in VS2010 on Windows 7.</p>
  
  <p>Any resolution?</p>