title: The type 'IEnumerable<>' is defined in an assembly that is not referenced. System.Runtime
body: <p>I have an asp.net 5 web application that references a class library. </p>
  
  <p>That class library use Entity Framework 7 to perform a query. </p>
  
  <pre><code>public IEnumerable&lt;Member&gt; GetMemberyByFirstName(string firstName)
  {
      var members = _context.Members.Where(m =&gt; m.FirstName.Contains(firstName));
      return memebers;
  }
  </code></pre>
  
  <p>But I get this compile error</p>
  
  <blockquote>
    <p>The type 'IEnumerable&lt;>' is defined in an assembly that is not
    referenced. You must add a reference to assembly 'System.Runtime,
    Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.
    *</p>
  </blockquote>