ng CLI 1.5.5: ERROR Error: Uncaught (in promise): EmptyError: no elements in sequence

Versions

Angular CLI: 1.5.5
Node: 9.2.0
OS: darwin x64
Angular: 5.0.5

Repro steps

Difficult to reproduce. I guess this is more a question of how to track the bug.

I have an Angular 5 app, which I upgraded from using the CLI from 1.5.0 to 1.5.4. In these versions the bug does not happen.

But with CLI 1.5.5 I do see the bug, when started with the CLI or bundled in a Web-Archive (.WAR file) deployed in an OSGi container.

Observed behavior

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 EmptyObservable._subscribe (EmptyObservable.js:83)
    at EmptyObservable.Observable._trySubscribe (Observable.js:172)
    at EmptyObservable.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 EmptyObservable._subscribe (EmptyObservable.js:83)
    at EmptyObservable.Observable._trySubscribe (Observable.js:172)
    at EmptyObservable.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 ZoneTask.invokeTask [as invoke] (zone.js:503)
    at invokeTask (zone.js:1540)

In Chrome Dev Tools, I pause on caught exceptions. Still, I have difficulty in idetifying the cause.

Desired behavior

This happens right in the login page. The page does not change to the first page that is authenticated. I also commented the guard which is used to secure the routes. The error still shows up.

Mention any other details that might be useful (optional)

[nawnitraman]

The suggested fix of downgrading “rxjs” to “5.5.2” didn’t worked for me, but the workaround (adding pathMatch: ‘full’) suggested by @fabiogodoy resolved my issue. { path: ‘’, component: HomeComponent, pathMatch: ‘full’ }, { path: ‘about’, component: AboutComponent, pathMatch: ‘full’ }

[austinthedeveloper]

@nawnitraman when you downgraded rxjs, did you remove node_modules and re-install? I just changed “^5.5.2” to “5.5.2” and the error went away.