title: Found conflicts between different versions of the same dependent assembly that could not be resolved error
body: <blockquote>
  <p>Found conflicts between different versions of the same dependent assembly that could not be resolved.  These reference conflicts are listed in the build log when log verbosity is set to detailed.</p>
  </blockquote>
  <p>It's happened after I'm import <strong>Newtonsoft.Json</strong> to my  App.Core(Portable) project.</p>
  <p>After a look in the output:</p>
  <blockquote>
  <p>There was a conflict between &quot;Microsoft.CSharp, Version=2.0.5.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a&quot; and &quot;Microsoft.CSharp, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a&quot;. (TaskId:90)
  2&gt;      &quot;Microsoft.CSharp, Version=2.0.5.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a&quot; was chosen because it was primary and &quot;Microsoft.CSharp, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a&quot; was not. (TaskId:90)</p>
  </blockquote>
  <p>What I need to do now?</p>