系统异常：错误

Question

我正试图从优步获取用户活动。以下是代码

public async Task<ActionResult> Callback(string code)
{
    var auth = new AuthenticationClient();
    await auth.WebServerAsync(_clientId, _clientSecret, _callbackUrl, code);

    Session["ApiVersion"] = auth.ApiVersion;
    Session["AccessToken"] = auth.AccessToken;
    Session["RefreshToken"] = auth.RefreshToken;

    var client = new UberClient(TokenTypes.Access, auth.AccessToken, "v1", new HttpClient());

    var userActivity = await client.UserActivityAsync(); //error here
    var user = await client.UserAsync();

    return RedirectToAction("Index", "Home");
}

这是错误跟踪

  

[例外：错误] Uber.d__19 1.MoveNext() +1738
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +93
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +52 System.Runtime.CompilerServices.TaskAwaiter 1.GetResult（）   +24 Uber.d__f.MoveNext（）+691 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（Task   任务）+93
  System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务   任务）+52 System.Runtime.CompilerServices.TaskAwaiter 1.GetResult() +24 Web.Controllers.<Callback>d__0.MoveNext() in d:\TDS\uber-sdk-for-net-master-1\samples\Web\Controllers\LoginController.cs:42 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +93
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +52 System.Runtime.CompilerServices.TaskAwaiter.GetResult() +21 System.Threading.Tasks.TaskHelpersExtensions.ThrowIfFaulted(Task task) +61 System.Web.Mvc.Async.TaskAsyncActionDescriptor.EndExecute(IAsyncResult asyncResult) +114
System.Web.Mvc.Async.<>c__DisplayClass37.<BeginInvokeAsynchronousActionMethod>b__36(IAsyncResult asyncResult) +66
System.Web.Mvc.Async.WrappedAsyncResult 1.CallEndDelegate（IAsyncResult）   asyncResult）+47
  System.Web.Mvc.Async.WrappedAsyncResultBase 1.End() +136
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +102
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) +49
System.Web.Mvc.Async.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3d() +117 System.Web.Mvc.Async.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f() +323 System.Web.Mvc.Async.<>c__DisplayClass33.<BeginInvokeActionMethodWithFilters>b__32(IAsyncResult asyncResult) +44
System.Web.Mvc.Async.WrappedAsyncResult 1.CallEndDelegate（IAsyncResult的   asyncResult）+47
  System.Web.Mvc.Async.WrappedAsyncResultBase 1.End() +136
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +102
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +50
System.Web.Mvc.Async.<>c__DisplayClass2b.<BeginInvokeAction>b__1c() +72 System.Web.Mvc.Async.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult) +185
System.Web.Mvc.Async.WrappedAsyncResult 1.CallEndDelegate（IAsyncResult的   asyncResult）+42
  System.Web.Mvc.Async.WrappedAsyncResultBase 1.End() +133
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +56
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +40
System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +34
System.Web.Mvc.Async.WrappedAsyncVoid 1.CallEndDelegate（IAsyncResult的   asyncResult）+70
  System.Web.Mvc.Async.WrappedAsyncResultBase 1.End() +139
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +59
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +40
System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +44 System.Web.Mvc.Controller.<BeginExecute>b__15(IAsyncResult asyncResult, Controller controller) +39
System.Web.Mvc.Async.WrappedAsyncVoid 1.CallEndDelegate（IAsyncResult的   asyncResult）+62
  System.Web.Mvc.Async.WrappedAsyncResultBase 1.End() +139
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +59
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +40 System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +39
System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +39
System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState) +39
System.Web.Mvc.Async.WrappedAsyncVoid 1.CallEndDelegate（IAsyncResult的   asyncResult）+70
  System.Web.Mvc.Async.WrappedAsyncResultBase`1.End（）+139
  System.Web.Mvc.Async.AsyncResultWrapper.End（IAsyncResult asyncResult，   对象标签）+59
  System.Web.Mvc.Async.AsyncResultWrapper.End（IAsyncResult asyncResult，   对象标签）+40
  System.Web.Mvc.MvcHandler.EndProcessRequest（IAsyncResult asyncResult）   +40 System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest（IAsyncResult）   结果）+38
  System.Web.CallHandlerExecutionStep.OnAsyncHandlerCompletion（IAsyncResult的   ar）+129

有人可以向我解释这是什么错误吗？提前致谢。代码最初来自WadeWegner Uber SDK。