Erro 401 unauthorized

Estou com o mesmo erro de outras pessoas no tópico, mas as soluções apresentadas não estão servindo pra mim .

photo.service.ts

import { HttpClient, HttpParams } from '@angular/common/http';
import { Injectable } from '@angular/core';

import { Photo } from "./photo";

const API = 'http://localhost:3000';

@Injectable({providedIn: 'root'})
export class PhotoService{

    constructor(private http: HttpClient){}

    listFromUser(userName: string){
        return this.http.get<Photo[]>(API + '/' + userName + '/photos');
    }

    listFromUserPaginated(userName: string, page: number){
        const params = new HttpParams().append('page', page.toString());

        return this.http.get<Photo[]>(API + '/' + userName + '/photos', {params});
    }

    upload(description: string, allowComments: boolean, file: File) {

        const formData = new FormData();
        formData.append('description', description);
        formData.append('allowComments', allowComments ? 'true' : 'false');
        formData.append('imageFile', file);

        return this.http.post(API + '/photos/upload', formData);

    }

}``

photo-form.component.ts

import { Component, OnInit } from '@angular/core'; import { FormBuilder, FormGroup, Validators } from '@angular/forms'; import { PhotoService } from '../photo/photo.service'; import { Router } from '@angular/router';

@Component({ selector: 'ap-photo-form', templateUrl: './photo-form.component.html', styleUrls: ['./photo-form.component.css'] }) export class PhotoFormComponent implements OnInit {

photoForm: FormGroup; file: File; Service: any;

constructor( private formBuilder: FormBuilder, private photoService: PhotoService, private router: Router ) { }

ngOnInit() { this.photoForm = this.formBuilder.group({ file: ['', Validators.required], description: ['', Validators.maxLength(300)], allowComments: [true], }); }

upload() { const description = this.photoForm.get('description').value; const allowComments = this.photoForm.get('allowComments').value; this.photoService.upload(description, allowComments, this.file).subscribe(() => { return this.router.navigate(['']); }); } }``