title: Getting Error Descriptions From Restkit
body: <p>When my web service returns an error, I want to display the error message that was sent back with the response. I can't find any way of doing this in RestKit. I've tried setting the error mapping property of the object manager, and using the following suggestion: </p>
  
  <p><a href="https://stackoverflow.com/questions/9841203/restkit-json-error-response-msg-from-server">Restkit json error response msg from server</a></p>
  
  <p>But this doesn't work for me. For one thing, RKErrorMessage doesn't seem to exist anymore. </p>
  
  <p>Any help appreciated.</p>