我正在将我的Angular2应用程序从2.0.0升级到2.3.0，我遇到了以下错误。任何想法为什么？我看到了另一篇文章(
Angular 2.0.1 Router EmptyError: no elements in sequence)，但在尝试之后，问题仍然存在。是什么导致这个错误？
Error: Uncaught (in promise): EmptyError: no elements in sequence
Error: no elements in sequence
at EmptyError.ZoneAwareError (zone.js:672)
at new EmptyError (EmptyError.ts:13)
at FirstSubscriber._complete (first.ts:161)
at FirstSubscriber.Subscriber.complete (Subscriber.ts:122)
at Subject._subscribe (Subject.ts:109)
at Subject.Observable.subscribe (Observable.ts:98)
at Observable._subscribe (Observable.ts:158)
at Observable.subscribe (Observable.ts:98)
at Observable._subscribe (Observable.ts:158)
at FirstOperator.call (first.ts:82)
at Observable.subscribe (Observable.ts:96)
at Object.subscribeToResult (subscribeToResult.ts:32)
at MergeAllSubscriber._next (mergeAll.ts:82)
at MergeAllSubscriber.Subscriber.next (Subscriber.ts:95)
at MapSubscriber._next (map.ts:80)
at resolvePromise (zone.js:475) [angular]
at resolvePromise (zone.js:460) [angular]
at /libs/zone.js/dist/zone.js:509:17 [angular]
at Object.onInvokeTask (core.umd.min.js:32) [angular]
at ZoneDelegate.invokeTask (zone.js:261) [angular]
at Zone.runTask (zone.js:151) [<root> => angular]
at drainMicroTaskQueue (zone.js:405) [<root>]
at ZoneTask.invoke (zone.js:336) [<root>]ErrorHandler.handleError @ core.umd.min.js:31next @ core.umd.min.js:32generatorOrNext.object.schedulerFn @ core.umd.min.js:32SafeSubscriber.__tryOrUnsub @ Subscriber.ts:238SafeSubscriber.next @ Subscriber.ts:190Subscriber._next @ Subscriber.ts:135Subscriber.next @ Subscriber.ts:95Subject.next @ Subject.ts:61EventEmitter.emit @ core.umd.min.js:32NgZone.triggerError @ core.umd.min.js:32onHandleError @ core.umd.min.js:32ZoneDelegate.handleError @ zone.js:233Zone.runGuarded @ zone.js:129_loop_1 @ zone.js:416drainMicroTaskQueue @ zone.js:425ZoneTask.invoke @ zone.js:336
我还注意到当我尝试更改为使用Guards的路由时会抛出NavigationError对象。但只有上面的错误是控制台中显示的内容。
NavigationError {id：2，url：“/ home”，错误：EmptyError}
我有点不知所措，并希望得到任何帮助。
