title: Error when upgrading to WebAPI 2.1 XmlDocumentationProvider does not implement interface member GetDocumentation
body: <p>I'm following the tutorial here:</p>
  
  <p><a href="http://www.asp.net/web-api/overview/releases/whats-new-in-aspnet-web-api-21#download">http://www.asp.net/web-api/overview/releases/whats-new-in-aspnet-web-api-21#download</a></p>
  
  <p>I created an MVC Web Api project in Visual Studio 2012 (.NET Framework 4.5), and ran this command in my NuGet Package Manager Console Install-Package Microsoft.AspNet.WebApi</p>
  
  <p>When I tried to build my project, I get this error:</p>
  
  <pre><code>'CommonServices.Areas.HelpPage.XmlDocumentationProvider' does not implement interface member 
      'System.Web.Http.Description.IDocumentationProvider.GetDocumentation(System.Web.Http.Controllers.HttpControllerDescriptor)' c:\users\administrator\documents\visual studio 2012\Projects\CommonServices\CommonServices\Areas\HelpPage\XmlDocumentationProvider.cs
  
  'CommonServices.Areas.HelpPage.XmlDocumentationProvider' does not implement interface member 
      'System.Web.Http.Description.IDocumentationProvider.GetResponseDocumentation(System.Web.Http.Controllers.HttpActionDescriptor)' c:\users\administrator\documents\visual studio 2012\Projects\CommonServices\CommonServices\Areas\HelpPage\XmlDocumentationProvider.cs
  </code></pre>
  
  <p>Is there something I missed?</p>