title: 'ServiceModel' does not exist in namespace 'System'. When I try to add a reference, it says it's already referenced
body: <p>I'm using Visual Studio Professional 2013, and I'm trying to import an ASP.NET web site whose files were on SVN so that I can run and debug the website locally. I created a new web site and changed the target framework to .NET 3.5 (that's what the guys who built the website told me it was in). So, I copied over the files to the website directory, and added them into the solution using "add->existing web site".</p>
  
  <p>I get this error specifically:</p>
  
  <pre><code>The type or namespace name 'ServiceModel' does not exist in the namespace 'System' (are you missing an assembly reference?)
  </code></pre>
  
  <p>So, I think to myself, I'll just add a reference to ServiceModel, no big deal. So, I right-click the project, go to add reference, look for System.ServiceModel under Assemblies->Framework, check it, and click ok. Then this happens:</p>
  
  <pre><code>The Web site is already referencing the assembly 'System.ServiceModel'.
  </code></pre>
  
  <p>These things might help:</p>
  
  <ul>
  <li>My target framework is not "Client Profile". That option isn't available to me in VS2013</li>
  <li>When I make a new web site project and just add a basic class file, I can use the System.ServiceModel namespace because it's already referenced. </li>
  <li>When I look in Class View at "Project References", I don't see System.ServiceModel. In the above "new website project", I DO see System.ServiceModel under Class View.</li>
  </ul>