Reactjs react应用程序在heroku启动时崩溃，本地工作正常

无法从heroku成功启动react应用程序，部署看起来成功，但在启动时崩溃

这里是包和日志

谢谢

Package.json

 {
  "name": "recmytrip",
  "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",
    "axios": "^0.19.2",
    "bootstrap": "^4.5.2",
    "react": "^16.13.1",
    "react-dom": "^16.13.1",
    "react-redux": "^7.2.1",
    "react-router-dom": "^5.2.0",
    "react-scripts": "3.4.3",
    "react-validation": "^3.0.7",
    "redux": "^4.0.5",
    "redux-thunk": "^2.3.0",
    "validator": "^13.1.1"
  },
  "engines": { "npm": "6.x", "node": "14.x" },
  "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"
    ]
  },
  "devDependencies": {
    "redux-devtools-extension": "^2.13.8"
  }
}

日志输出

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为什么要在生产环境中运行dev服务器？