Deserializing response

I am using RestRequest to do a POST to a web service. The response is in JSON format, but I receive it in response. Content is ASCII and Data is null. code:

        var request = new RestRequest(api, Method.POST);
        request.RequestFormat = DataFormat.Json;
        request.AddObject(data);

        RestClient client = new RestClient("http://IP:PORT/proto");           
        client.ExecuteAsync<jLoginResponse>(request, (response) =>
        {
            var resource = response.Data;
        });

      

        
        
        
      

    

and here response.Data is empty and Content is {"UID": "1234"}

jLoginResponse is declared as

[DataContract]
public class jLoginResponse
{
    public string uid { get; set; }
}

      

        
        
        
      

    

but it will not be automatically deserialized as it should.