Ошибка при использовании интерфейса и Observable с разбором http

Структура файла в VS с ошибкой

app(folder)
  -->employee-list(folder)
       -->employee-list.component.html
       -->employee-list.component.ts
  -->app.component.html
  -->app.component.ts
  -->app.module.ts

  -->employee.json
  -->employee.service.ts
  -->employee.ts

Здесь все файлы находятся на одном уровне, и я передаю данные из employee.json в компонент employee с помощью метода HTTP get. но выдает ошибку

Error
message: "Http failure during parsing for https://htpgeterror.stackblitz.io/employee.json" name: "HttpErrorResponse", error:Object

сотрудник.json

[
  {"id":2,"name":"Shiva","age":23},
  {"id":3,"name":"ABC","age":25},
]

сотрудник.тс

export interface Employee {
  id:number,
  name:string,
  age:number,
}

сотрудник.service.ts

import { Injectable } from '@angular/core';
import {HttpClient} from '@angular/common/http';
import {Employee} from './employee';
import {Observable} from 'rxjs';

@Injectable()
export class EmployeeService {
public _url:string = "./employee.json";
  constructor(private http:HttpClient) { }

  getEmp(): Observable<Employee[]>{
    return this.http.get<Employee[]>(this._url);
  }
}

список сотрудников.component.ts

import { Component, OnInit } from '@angular/core';
import {EmployeeService} from '../employee.service';

@Component({
  selector: 'app-employee-list',
  templateUrl: './employee-list.component.html',
  styleUrls: ['./employee-list.component.css']
})
export class EmployeeListComponent implements OnInit {
 public employee=[];
 constructor(private _employeeService:EmployeeService) { }

  ngOnInit() {
    this._employeeService.getEmp()
        .subscribe(data => this.employee = data);
  }
}

Стекблиц-адрес https://stackblitz.com/edit/htpgeterror