ReactJS:启动服务器时未能编译错误

我是ReactJS的初学者。刚完成关于React和Redux基础知识的课程。我已经开始了一门新的课程，题为“React Data Visualization-构建加密货币仪表板”。我在第4课中遇到了一个问题，当时我正试图使用

warn start

命令启动服务器：

Failed to compile
./src/index.js
Cannot find file: 'index.js' does not match the corresponding name on disk: '.\src\App\app'.

以下是我在

app

目录下

index.js

文件中的代码：

import React, { Component } from 'react';
import './App.css';

class App extends Component {
  render(){
    return (
      <div>
        Hello World
      </div>
    );
  }

}

export default App;

import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';
import * as serviceWorker from './serviceWorker';

ReactDOM.render(<App />, document.getElementById('root'));

// If you want your app to work offline and load faster, you can change
// unregister() to register() below. Note this comes with some pitfalls.

我如何解决这个问题

您可以在此处找到项目文件

编辑1：我正在package.json文件中添加代码，正如@Wesgur所建议的：

{
  "name": "cryptodash",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@testing-library/jest-dom": "^4.2.4",
    "@testing-library/react": "^9.3.2",
    "@testing-library/user-event": "^7.1.2",
    "react": "^16.12.0",
    "react-dom": "^16.12.0",
    "react-scripts": "3.4.0"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": "react-app"
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  }
}

编辑2：我正在添加图像以显示文件夹结构，如@Madhavan.V所示： 从“/App”导入应用程序；

---

这将导入应用程序文件夹的index.js。

@Shawan它只是一个输入错误，将src/index中的app import语句从

导入app from./app'到
从“/App”导入应用程序
您是否也可以添加您的
package.json
？@Wesgur我已将
package.json
文件的代码添加到问题中。@Shawn检查导入
import App from./App'
@Shawn您能否尝试将
src/index
中的导入更改为
import-App from./App'
我认为您是从
/App
导入的，而不是
/App