title: Can't build project with VS2015
body: <p>I have a problem with my project (it worked before) I did a clean checkout from the teamserver... and now I can't build. But VS shows me no error:</p>
  
  <p><a href="https://i.stack.imgur.com/lDYj3.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/lDYj3.png" alt="enter image description here"></a></p>
  
  <p>but in the output I can see some errors</p>
  
  <p><a href="https://i.stack.imgur.com/TJb1X.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/TJb1X.png" alt="enter image description here"></a></p>
  
  <p>But these files are fine:</p>
  
  <p><a href="https://i.stack.imgur.com/CVNgq.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/CVNgq.png" alt="enter image description here"></a></p>
  
  <p>no errors... all libs are fine.</p>
  
  <p>Any idea where to search for the problem?</p>
  
  <p>PS: it looks for me like the build script cant find packages... but I am not really sure.</p>
  
  <p>I also checked my csproj file</p>
  
  <pre><code>&lt;Reference Include="System.Web.Http, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL"&gt;
        &lt;HintPath&gt;..\packages\Microsoft.AspNet.WebApi.Core.4.0.30506.0\lib\net40\System.Web.Http.dll&lt;/HintPath&gt;
      &lt;/Reference&gt;
  </code></pre>
  
  <p>the file is present.</p>