How do I trace an `EmptyError: no elements in sequence` bug in an angular project

问题

I'm working on an Angular project that's throwing an error: core.js:1350 ERROR Error: Uncaught (in promise): EmptyError: no elements in sequence but I can't seem to trace it to any of my app source code. The stack trace all points to rxjs classes.

Can anyone tell me how I can debug this error so that I can get to the real error in the code?

core.js:1350 ERROR Error: Uncaught (in promise): EmptyError: no elements in sequence
EmptyError: no elements in sequence
    at new EmptyError (EmptyError.js:28)
    at FirstSubscriber._complete (first.js:154)
    at FirstSubscriber.Subscriber.complete (Subscriber.js:122)
    at MergeMapSubscriber._complete (mergeMap.js:150)
    at MergeMapSubscriber.Subscriber.complete (Subscriber.js:122)
    at MapSubscriber.Subscriber._complete (Subscriber.js:140)
    at MapSubscriber.Subscriber.complete (Subscriber.js:122)
    at ArrayObservable._subscribe (ArrayObservable.js:124)
    at ArrayObservable.Observable._trySubscribe (Observable.js:172)
    at ArrayObservable.Observable.subscribe (Observable.js:160)
    at new EmptyError (EmptyError.js:28)
    at FirstSubscriber._complete (first.js:154)
    at FirstSubscriber.Subscriber.complete (Subscriber.js:122)
    at MergeMapSubscriber._complete (mergeMap.js:150)
    at MergeMapSubscriber.Subscriber.complete (Subscriber.js:122)
    at MapSubscriber.Subscriber._complete (Subscriber.js:140)
    at MapSubscriber.Subscriber.complete (Subscriber.js:122)
    at ArrayObservable._subscribe (ArrayObservable.js:124)
    at ArrayObservable.Observable._trySubscribe (Observable.js:172)
    at ArrayObservable.Observable.subscribe (Observable.js:160)
    at resolvePromise (zone.js:824)
    at resolvePromise (zone.js:795)
    at eval (zone.js:873)
    at ZoneDelegate.invokeTask (zone.js:425)
    at Object.onInvokeTask (core.js:4621)
    at ZoneDelegate.invokeTask (zone.js:424)
    at Zone.runTask (zone.js:192)
    at drainMicroTaskQueue (zone.js:602)
    at <anonymous>

回答1:

This bug is due to the last version of Angular's Router. You can reverse your version or append pathMatch: 'full' to all of your routes.

See github issue.

Example

来源：https://stackoverflow.com/questions/47612171/how-do-i-trace-an-emptyerror-no-elements-in-sequence-bug-in-an-angular-projec

标签

javascript

angular

rxjs