未找到 Flutter Firebase 函数

如何解决未找到 Flutter Firebase 函数

我正在尝试使用 twilio_voice 库提供的示例设置带有 Flutter 的 Twilio VOIP 应用程序。依赖项之一是 cloud_functions，当我尝试设置语音访问令牌时会导致问题。

有问题的代码行：

final function = FirebaseFunctions.instanceFor(region: "us-east1").httpsCallable("voice-accesstoken");

错误日志：

[ERROR:Flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception: [firebase_functions/not-found] NOT_FOUND
#0      catchPlatformException (package:cloud_functions_platform_interface/src/method_channel/utils/exception.dart:21:3)
#1      _rootRunBinary (dart:async/zone.dart:1378:47)
#2      _CustomZone.runBinary (dart:async/zone.dart:1272:19)
#3      _FutureListener.handleError (dart:async/future_impl.dart:169:20)
#4      Future._propagatetoListeners.handleError (dart:async/future_impl.dart:719:47)
#5      Future._propagatetoListeners (dart:async/future_impl.dart:740:24)
#6      Future._completeError (dart:async/future_impl.dart:550:5)
#7      _completeOnAsyncError (dart:async-patch/async_patch.dart:274:13)
#8      MethodChannel._invokeMethod (package:Flutter/src/services/platform_channel.dart)
<asynchronous suspension>

如您所见，云函数抛出了未找到的错误。我已经尝试过设置区域。我该如何解决这个问题？