React.js：无法使用“ npm start”启动开发服务器

Question

当我使用npm start启动开发服务器时，出现以下错误：

D:\react\app\app>npm start
    
> app@0.1.0 start D:\react\app\app
> react-scripts start
    
  Starting the development server...
    
  events.js:292
      throw er; // Unhandled 'error' event
      ^
    
  Error: spawn cmd ENOENT
      at Process.ChildProcess._handle.onexit (internal/child_process.js:267:19)
      at onErrorNT (internal/child_process.js:469:16)
      at processTicksAndRejections (internal/process/task_queues.js:84:21)
  Emitted 'error' event on ChildProcess instance at:
      at Process.ChildProcess._handle.onexit (internal/child_process.js:273:12)
      at onErrorNT (internal/child_process.js:469:16)
      at processTicksAndRejections (internal/process/task_queues.js:84:21) 
    {
      errno: 'ENOENT',
      code: 'ENOENT',
      syscall: 'spawn cmd',
      path: 'cmd',
      spawnargs: [ '/s', '/c', 'start', '""', '/b', '"http://localhost:3000/"' ]
    }
    npm ERR! code ELIFECYCLE
    npm ERR! errno 1
    npm ERR! app@0.1.0 start: `react-scripts start`
    npm ERR! Exit status 1
    npm ERR!
    npm ERR! Failed at the app@0.1.0 start script.
    npm ERR! This is probably not a problem with npm. 
             There is likely additional logging output above.
    
    npm ERR! A complete log of this run can be found in:
    npm ERR! C:\Users\Futuresoft\AppData\Roaming\npm-cache\_logs\2020-08-04T09_21_21_144Z-debug.log

反应应用程序package.json文件

    {
      "name": "app",
      "version": "0.1.0",
      "private": true,
      "dependencies": {
        "@testing-library/jest-dom": "^4.2.4",
        "@testing-library/react": "^9.5.0",
        "@testing-library/user-event": "^7.2.1",
        "react": "^16.13.1",
        "react-dom": "^16.13.1",
        "react-scripts": "3.4.1"
      },
      "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"
        ]
      }
    }

我使用以下命令全局安装了create-react-app：

npm install -g create-react-app

谁能告诉我是什么导致了此错误？
我从3天开始挠头，但无法修复。请帮忙。