Dotnetopenauth

[ProtocolException: The following required parameters were missing from the DotNetOpenAuth.OAuth2.Messages.EndUserAuthorizationFailedResponse message: error]
   DotNetOpenAuth.Messaging.ErrorUtilities.VerifyProtocol(Boolean condition, String message, Object[] args) in c:\BuildAgent\work\35657a53ee36436f\src\DotNetOpenAuth\Messaging\ErrorUtilities.cs:235
   DotNetOpenAuth.Messaging.ErrorUtilities.ThrowProtocol(String message, Object[] args) in c:\BuildAgent\work\35657a53ee36436f\src\DotNetOpenAuth\Messaging\ErrorUtilities.cs:254
   DotNetOpenAuth.Messaging.Reflection.MessageDescription.CheckRequiredMessagePartsArePresent(IEnumerable`1 keys, Boolean throwOnFailure) in c:\BuildAgent\work\35657a53ee36436f\src\DotNetOpenAuth\Messaging\Reflection\MessageDescription.cs:152
   DotNetOpenAuth.Messaging.Reflection.MessageDescription.EnsureMessagePartsPassBasicValidation(IDictionary`2 parts) in c:\BuildAgent\work\35657a53ee36436f\src\DotNetOpenAuth\Messaging\Reflection\MessageDescription.cs:116
   DotNetOpenAuth.Messaging.Channel.EnsureValidMessageParts(IProtocolMessage message) in c:\BuildAgent\work\35657a53ee36436f\src\DotNetOpenAuth\Messaging\Channel.cs:1357
   DotNetOpenAuth.Messaging.Channel.ProcessOutgoingMessage(IProtocolMessage message) in c:\BuildAgent\work\35657a53ee36436f\src\DotNetOpenAuth\Messaging\Channel.cs:999
   DotNetOpenAuth.Messaging.Channel.PrepareResponse(IProtocolMessage message) in c:\BuildAgent\work\35657a53ee36436f\src\DotNetOpenAuth\Messaging\Channel.cs:316
   OAuthAuthorizationServer.Controllers.OAuthController.AuthorizeResponse(Boolean isApproved) in C:\Users\Daniel\Downloads\DotNetOpenAuth-4.0.0.11165\Samples\OAuthAuthorizationServer\Controllers\OAuthController.cs:126
   lambda_method(Closure , ControllerBase , Object[] ) +151
   System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) +51
   System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +409
   System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +52
   System.Web.Mvc.<>c__DisplayClassd.<InvokeActionMethodWithFilters>b__a() +127
   System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +436
   System.Web.Mvc.<>c__DisplayClassf.<InvokeActionMethodWithFilters>b__c() +61
   System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +305
   System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +830
   System.Web.Mvc.Controller.ExecuteCore() +136
   System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +111
   System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) +39
   System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__4() +65
   System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +44
   System.Web.Mvc.Async.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _) +42
   System.Web.Mvc.Async.WrappedAsyncResult`1.End() +141
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +54
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +40
   System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +52
   System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +38
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +8963149
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +184