无效的令牌错误：指定的令牌无效：无法读取未定义的属性“替换”

Question

嗨，我在后端使用Django，在前端使用Angular，尝试登录时收到无效令牌错误：指定的令牌无效：无法读取未定义的属性“ replace”，您知道这是什么问题??

这是user.service.ts的主音

import { Injectable } from '@angular/core';
import {HttpClient,HttpHeaders, HttpInterceptor, HttpRequest, HttpHandler, HttpEvent} from '@angular/common/http';
import { Observable } from 'rxjs/Observable';
import { CanActivate,Router } from '@angular/router'
import { tap, shareReplay } from 'rxjs/operators';

import * as jwtDecode from 'jwt-decode';
import * as moment from 'moment';

import { environment } from '../environments/environment';


@Injectable({
  providedIn: 'root'
})

export class UserService {

  constructor(private http:HttpClient,
              private _router: Router) { }

  
  private setSession(authResult) {
    const token = authResult.token;
    const payload = <JWTPayload> jwtDecode(token);
    const expiresAt = moment.unix(payload.exp);

    localStorage.setItem('token', authResult.token);
    localStorage.setItem('expires_at', JSON.stringify(expiresAt.valueOf()));
  }

  loginUser(userData):Observable<any>{
    return this.http.post('http://127.0.0.1:8000/MyProjects/auth/',
                           userData
                           ).pipe(
                           tap(response => this.setSession(response)),
                           shareReplay(),
                           );
  }
 
}

interface JWTPayload {
  user_id: number;
  username: string;
  email: string;
  exp: number;
}