title: Method not found: 'Void Newtonsoft.Json.Serialization.DefaultContractResolver.set_IgnoreSerializableAttribute(Boolean)' (webapi and PCL)
body: <p>Similar to <a href="https://stackoverflow.com/questions/24087078/method-not-found-void-newtonsoft-json-serialization-defaultcontractresolver-se">this question</a>, which was marked as a duplicate (so I couldn't answer it directly).</p>
  
  <p>I have a webapi project, which references a PCL project.
  I was getting this DefaultContractResolver error intermittently.</p>
  
  <p>I had tried all of the troubleshooting steps from that other question, largely involving uninstalling and reinstalling the nuget packages. Didn't help.</p>