错误TypeError：无法读取未定义的属性'tokenGetter'

Question

错误TypeError：无法读取未定义的属性'tokenGetter'

我在调用http请求时遇到了错误

登录组件代码

this.userData.login(this.loginForm.value).subscribe(data => {
    this.user = data;
    console.log('USER DATA : '+ this.user);
  });

用户服务代码

public login(userData: User): Observable<User> {

console.log('USER DATA SERVICE');
return this.http.post<User>(`${this.apiUrl}/userlogin.php`, userData);
  // return this.http.get<User>(`${this.apiUrl}/userlogin.php?username=${username}&password=${password}`).pipe(
  //   catchError(this.handleError)
  // );
}