TS2339:(TS) Property 'catch' does not exist on type 'Observable<Object>'

My code which I tried to implement, it shows 'catch' does not exist:

import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders } from '@angular/common/http';
import { Observable } from 'rxjs';
import { User } from '../Model/User';
import { environment } from '../../environments/environment';
import 'rxjs/add/operator/catch';

@Injectable()
export class UserService {
headers: HttpHeaders;
constructor(private httpClient: HttpClient) {
this.headers = new HttpHeaders({ 'content-type': 'application/json' });
}
GetUser(): Observable<User[]> {
return this.httpClient.get(environment.apiAddress + '/user').catch(err => Observable.throw(err));
}
}

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