EmptyError: no elements in sequence

I'm upgrading my Angular2 app from 2.0.0 to 2.3.0, and I'm running into the following error. Any ideas as to why? I saw this other post (Angular 2.0.1 Router EmptyError: no elements in sequence), but after trying this, the issue still remains. What causes this error?

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


I've also noticed that a NavigationError object is thrown when I try to change to a route that uses Guards. But only the error above is what is shown in the console.

NavigationError {id: 2, url: "/home", error: EmptyError}

I'm kind of at a loss and would appreciate any help.

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