执行npm start 后报错

问题描述：

执行npm start命令后报错该怎解决呢？

相关代码：

//index.js相关代码:相关截图：
​import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';


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

相关代码：

//App.js相关代码：​
​function App() {
  return (
    <div className="App">
      Hello World
    </div>
  );
}

export default App;

//命令行报错信息
C:\Users\72718\Desktop\reactjs>npm start
npm ERR! code ENOENT
npm ERR! syscall open
npm ERR! path C:\Users\72718\Desktop\reactjs\package.json
npm ERR! errno -4058
npm ERR! enoent ENOENT: no such file or directory, open 'C:\Users\72718\Desktop\reactjs\package.json'
npm ERR! enoent This is related to npm not being able to find a file.
npm ERR! enoent

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\72718\AppData\Roaming\npm-cache\_logs\2021-01-31T07_19_53_061Z-debug.log