react刷新找不到页面怎么办

Failed to lookup view "error" in views directory

app.set('views', path.join(__dirname, 'views'));
app.engine('.html',require('ejs').__express);
// app.set('view engine', 'jade');
app.set('view engine', 'html');
app.use(logger('dev'));
app.use(express.JSON());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public'))); //这句话就是express会读取public里面的静态文件

import React, { Component} from 'react';
 import { HashRouter  as Router  } from "react-router-dom";
 import Nav from './component/Menu/Menu';
 import FootContent from './component/Footer/Footer';
 import MinContent from './component/content/mainContent';
 import {Layout} from 'antd';
   class App extends Component {
     render() {
       return (
        <Layout className="layout">
        <Router>
        <div>
        <Nav  />
        <MinContent />
        </div>
      </Router>
      <FootContent />
      </Layout>
       );
     }
   }
 
   export default App;