admin-services.service.ts:208 TypeError: Cannot read property 'json' of null
    at MapSubscriber.eval [as project] (admin-services.service.ts:176)
    at MapSubscriber._next (map.js:79)
    at MapSubscriber.Subscriber.next (Subscriber.js:91)
    at MapSubscriber._next (map.js:85)
    at MapSubscriber.Subscriber.next (Subscriber.js:91)
    at FilterSubscriber._next (filter.js:90)
    at FilterSubscriber.Subscriber.next (Subscriber.js:91)
    at MergeMapSubscriber.notifyNext (mergeMap.js:151)
    at InnerSubscriber._next (InnerSubscriber.js:25)
    at InnerSubscriber.Subscriber.next (Subscriber.js:91)
(anonymous) @ admin-services.service.ts:208
CatchSubscriber.error @ catchError.js:105
MapSubscriber._next @ map.js:82
Subscriber.next @ Subscriber.js:91
MapSubscriber._next @ map.js:85
Subscriber.next @ Subscriber.js:91
FilterSubscriber._next @ filter.js:90
Subscriber.next @ Subscriber.js:91
MergeMapSubscriber.notifyNext @ mergeMap.js:151
InnerSubscriber._next @ InnerSubscriber.js:25
Subscriber.next @ Subscriber.js:91
onLoad @ http.js:2270
ZoneDelegate.invokeTask @ zone.js:425
onInvokeTask @ core.js:4744
ZoneDelegate.invokeTask @ zone.js:424
Zone.runTask @ zone.js:192
ZoneTask.invokeTask @ zone.js:499
invokeTask @ zone.js:1540
globalZoneAwareCallback @ zone.js:1566
XMLHttpRequest.send (async)
scheduleTask @ zone.js:2933
ZoneDelegate.scheduleTask @ zone.js:411
onScheduleTask @ zone.js:301
ZoneDelegate.scheduleTask @ zone.js:405
Zone.scheduleTask @ zone.js:236
Zone.scheduleMacroTask @ zone.js:259
(anonymous) @ zone.js:2966
proto.(anonymous function) @ zone.js:1366
(anonymous) @ http.js:2366
Observable._trySubscribe @ Observable.js:172
Observable.subscribe @ Observable.js:160
subscribeToResult @ subscribeToResult.js:23
MergeMapSubscriber._innerSub @ mergeMap.js:138
MergeMapSubscriber._tryNext @ mergeMap.js:135
MergeMapSubscriber._next @ mergeMap.js:118
Subscriber.next @ Subscriber.js:91
ScalarObservable._subscribe @ ScalarObservable.js:51
Observable._trySubscribe @ Observable.js:172
Observable.subscribe @ Observable.js:160
MergeMapOperator.call @ mergeMap.js:92
Observable.subscribe @ Observable.js:157
FilterOperator.call @ filter.js:61
Observable.subscribe @ Observable.js:157
MapOperator.call @ map.js:57
Observable.subscribe @ Observable.js:157
MapOperator.call @ map.js:57
Observable.subscribe @ Observable.js:157
CatchOperator.call @ catchError.js:80
Observable.subscribe @ Observable.js:157
AdminLoginComponent.onSubmit @ admin-login.component.ts:80
(anonymous) @ AdminLoginComponent.html:19
handleEvent @ core.js:13581
callWithDebugContext @ core.js:15090
debugHandleEvent @ core.js:14677
dispatchEvent @ core.js:9990
(anonymous) @ core.js:12332
schedulerFn @ core.js:4351
SafeSubscriber.__tryOrUnsub @ Subscriber.js:239
SafeSubscriber.next @ Subscriber.js:186
Subscriber._next @ Subscriber.js:127
Subscriber.next @ Subscriber.js:91
Subject.next @ Subject.js:56
EventEmitter.emit @ core.js:4319
NgForm.onSubmit @ forms.js:5751
(anonymous) @ AdminLoginComponent.html:19
handleEvent @ core.js:13581
callWithDebugContext @ core.js:15090
debugHandleEvent @ core.js:14677
dispatchEvent @ core.js:9990
(anonymous) @ core.js:10611
(anonymous) @ platform-browser.js:2628
ZoneDelegate.invokeTask @ zone.js:425
onInvokeTask @ core.js:4744
ZoneDelegate.invokeTask @ zone.js:424
Zone.runTask @ zone.js:192
ZoneTask.invokeTask @ zone.js:499
invokeTask @ zone.js:1540
globalZoneAwareCallback @ zone.js:1566
core.js:1427 ERROR Error: Unexpected Error Code: undefined
    at CatchSubscriber.eval [as selector] (admin-services.service.ts:216)
    at CatchSubscriber.error (catchError.js:105)
    at MapSubscriber._next (map.js:82)
    at MapSubscriber.Subscriber.next (Subscriber.js:91)
    at MapSubscriber._next (map.js:85)
    at MapSubscriber.Subscriber.next (Subscriber.js:91)
    at FilterSubscriber._next (filter.js:90)
    at FilterSubscriber.Subscriber.next (Subscriber.js:91)
    at MergeMapSubscriber.notifyNext (mergeMap.js:151)
at InnerSubscriber._next (InnerSubscriber.js:25)

adminLogin(username, password): Observable<boolean> {
    let url = `${this._apiRoot}/login`;
    let tokenResp = {};

    return this.http.post(url, JSON.stringify({ username: username, password: password }))
      .map((response: Response) => {

        // login successful if there's a token in the response
        let token = response.json() && response.json().token;

        if (token) {

          let t = JWT(token);

          console.log("-- what is in the token --");
          console.log(t);

          //initiialize
          let setUser: User = ANONYMOUS_USER;

          // need to set the value here
          this.userLoggedIn.next(setUser);

          // store username and jwt token in local storage to keep user logged in between page refreshes
          // => SET BACK: localStorage.setItem('currentUser', JSON.stringify(this.userLoggedIn));
          // => SET BACK: this.userLoggedIn = JSON.parse(localStorage.getItem('currentUser'));

          // return true to indicate successful login
          return true;
        } else {
          // throw an error that the token was "whack"
          return Observable.throw(
            new Error("APX: the token was not set properly"));
        }
        //return response.json();
      })
      .catch(e => {
        console.error(e);

        if (e.status === 401) {
          return Observable.throw(
            new Error("Error Code : 401 - Unauthorized Access To Server "));
        }

        return Observable.throw(
          new Error( "Unexpected Error Code: " + e.status ));
      });
  }