How to throw an error to a component?

Question

Angular

So at the moment I have a login component, which is engaged in obtaining a token from the backend through the authenticationService service. In the service, I have a catch that returns an error to the handleError function, it receives an error: Response. There I do something with it, well, let's just output it to the console. And then I would like the component to throw the error back and display the text to the user in the snackBare. In handleError I do return Observable.throw('Error!') But it doesn't throw what I wanted) I'll attach the code below:
AuthenticationService

logInSystem(login: string, password: string): Observable<{}>{
    let urlAuth = 'auth';
    let headers = new Headers({ 'Content-Type': 'application/json' });
    let options = new RequestOptions({ headers: headers, method: "post" });
    return this.http.post(this._url+urlAuth,{login,password},options)
      .map((res:Response) => res.json())
      .catch(this.handleError);
  }

  private handleError(error: any){
    let resMsg = '';
    if(error.json().username){
      resMsg = 'Вы неверно ввели логин или пароль';
    }
    return Observable.throw(resMsg);
  }

Login Component(Function called on ngSubmit)

doLogin(event){
    this.authenticationService.logInSystem(this.loginForm.value['login'],this.loginForm.value['password']).subscribe(
      data => {
        console.log(data);
      },
      err => {
        this.snackBar.open(err,'Закрыть',{
          duration: 3000,
        });
      }
    );
    this.loginForm.reset();
  }

Error in console:

TypeError: __WEBPACK_IMPORTED_MODULE_2_rxjs_Observable__.Observable.throw is not a function
    at CatchSubscriber.webpackJsonp.../../../../../src/app/authentication.service.ts.AuthenticationService.handleError [as selector] (authentication.service.ts:30)
    at CatchSubscriber.webpackJsonp.../../../../rxjs/operator/catch.js.CatchSubscriber.error (catch.js:104)
    at MapSubscriber.webpackJsonp.../../../../rxjs/Subscriber.js.Subscriber._error (Subscriber.js:128)
    at MapSubscriber.webpackJsonp.../../../../rxjs/Subscriber.js.Subscriber.error (Subscriber.js:102)
    at XMLHttpRequest.onLoad (http.es5.js:1231)
    at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:425)
    at Object.onInvokeTask (core.es5.js:3881)
    at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:424)
    at Zone.webpackJsonp.../../../../zone.js/dist/zone.js.Zone.runTask (zone.js:192)
    at ZoneTask.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneTask.invokeTask [as invoke] (zone.js:499)

I'm forwarding something else. How to do error forwarding?