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ERROR HttpErrorResponse {headers: HttpHeaders, status: 401, statusText: “OK”, url: “http://localhost:8080/hello”, ok: false, …}

I alwaaays get this error when trying to implement simple web service that display just a msg (angular5 + spring boot)
the error shown is in this img

this is my simple code:
controller.java:

@GetMapping("/hello")
public String sayhello(){ return "{"message": "Hello, world!"}";}
}


hello.component.ts:

import { Component, OnInit } from '@angular/core';
import { HttpClient, HttpErrorResponse, HttpParams } from '@angular/common/http';
import { Observable } from 'rxjs/Rx';
import { Adresse } from '../shared/adresse';
@Component({ selector: 'app-forgot', templateUrl: './forgot.component.html',
styleUrls: ['./forgot.component.css'] })
export class ForgotComponent implements OnInit {
message: string;
ip: string = Adresse.ip;
constructor(private http: HttpClient) { }
ngOnInit(): void {
this.http.get(this.ip+'/hello').subscribe(data=>
{console.log('DATA',data);
this.message= data['message'];}) }

}


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