Hi All,

I'm trying to get a little webapi running, but I am stuck with an error I get when trying to get data from my service using a passed parameter. The error I get is a null object reference somewhere in the underlying dll's:

[NullReferenceException: Object reference not set to an instance of an object.]
   System.Web.Http.WebHost.HttpControllerHandler.EndProcessRequest(IAsyncResult result) +159
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +606
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +288

My controller has two functions; 
 - GetModels that returns a list of 'Model': this function has no parameters and runs fine.
 - GetModelByName that should return a model by its name. Calling this function causes the error mentioned above.
   The URL used for this function is: http://dnndev.me/DesktopModules/Certigo.Policy.CreateModule/API/model/byname

Below is the sourcecode of my controller.

    [SupportedModules(Constants.DESKTOPMODULE_NAME)]
    public class ModelController : DnnApiController
    {
        /// <summary>
        /// API that returns an models list
        /// </summary>
        /// <returns></returns>
        [HttpPost, HttpGet]  //[baseURL]/model/list
        [ValidateAntiForgeryToken]
        [ActionName("list")]
        [DnnModuleAuthorize(AccessLevel = SecurityAccessLevel.View)]
        public HttpResponseMessage GetModels()
        {
            try
            {
                using (DialogServerClient client = new DialogServerClient())

                {

                    DialogModelRequest request = new DialogModelRequest()
                    {
                        Domain = Constants.POLICY_DOMAIN,
                        Process = Constants.POLICY_PROCESS
                    };
                    return Request.CreateResponse(HttpStatusCode.OK, client.GetModels(request).DialogModels);
                }
            }
            catch (Exception ex)
            {
                return Request.CreateResponse(HttpStatusCode.InternalServerError, ex.Message);
            }
        }

        /// <summary>
        /// API that returns a single model
       /// </summary>
        /// <returns></returns>
        [HttpPost, HttpGet]  //[baseURL]/model/byname
        [ValidateAntiForgeryToken]
        [ActionName("byname")]
        [DnnModuleAuthorize(AccessLevel = SecurityAccessLevel.View)]
        public HttpResponseMessage GetModel(RequestByName req)
        {
            try
            {
                using (DialogServerClient client = new DialogServerClient())
                {
                    DialogModelRequest request = new DialogModelRequest()
                    {
                        Domain = Constants.POLICY_DOMAIN,
                        Process = Constants.POLICY_PROCESS,
                        Name = req.Name
                    };
                    return Request.CreateResponse(HttpStatusCode.OK, client.GetModel(request).DialogModels);
                }
            }
            catch (Exception ex)
            {
                return Request.CreateResponse(HttpStatusCode.InternalServerError, ex.Message);
            }
        }
    }

    public class RequestByName
    {
        public string Name { get; set; }
    }