title: Referencing mscorlib 4.0.0.0 from .NET Core 1.0 class library
body: <p>I have a .NET Core 1.0 class library which targets .NET 4.6.1 and references the .NET Standard Library 1.6.0 and Identity Framework 2.2.1</p>
  
  <p><strong>project.json</strong></p>
  
  <pre><code>{
      "version": "1.0.0-*",
  
      "dependencies": {
          "Microsoft.AspNet.Identity.EntityFramework": "2.2.1",
          "System.Runtime": "4.1.0",
          "NETStandard.Library": "1.6.0"
      },
  
      "frameworks": {
          "netstandard1.6": {
              "imports": [
                  "net461"
              ]
          }
      }
  }
  </code></pre>
  
  <p>In my project I'm just creating the identity models, which extend the base Identity Framework models (User, Role etc). When I try to compile, this happens...</p>
  
  <p><a href="https://i.stack.imgur.com/EtSM5.png" rel="noreferrer"><img src="https://i.stack.imgur.com/EtSM5.png" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/hD0qT.png" rel="noreferrer"><img src="https://i.stack.imgur.com/hD0qT.png" alt="enter image description here"></a></p>
  
  <p>Any ideas how to resolve this?</p>