我在一个反应项目，运行完美，没有错误或警告时使用纱线启动，但当我尝试纱线构建我得到以下错误在我的控制台：

Cannot read property 'toLowerCase' of undefined
CompileError: Begins at CSS selector .m-n1

我已经在我的代码中搜索过了，在任何组件或SCS中都没有“.m-n1”类或类似的东西。

这是我的包裹。json文件

  "name": "removedForThisPost",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@clayui/alert": "^3.40.0",
    "@clayui/card": "^3.41.0",
    "@clayui/core": "^3.41.0",
    "@clayui/css": "^3.41.0",
    "@clayui/drop-down": "^3.41.0",
    "@clayui/empty-state": "^3.40.0",
    "@clayui/form": "^3.40.0",
    "@clayui/icon": "^3.40.0",
    "@testing-library/jest-dom": "^5.11.4",
    "@testing-library/react": "^11.1.0",
    "@testing-library/user-event": "^12.1.10",
    "@types/jest": "^26.0.15",
    "@types/node": "^12.0.0",
    "@types/react": "^17.0.0",
    "@types/react-dom": "^17.0.0",
    "axios": "^0.24.0",
    "react": "^17.0.2",
    "react-dom": "^17.0.2",
    "react-scripts": "4.0.3",
    "sass": "^1.45.0",
    "timeago.js": "^4.0.2",
    "typescript": "^4.1.6",
    "web-vitals": "^1.0.1"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": [
      "react-app",
      "react-app/jest"
    ]
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  }
}

额外信息：我正在为节点版本使用NVM，目前我在节点14.18。2（npm v6.14.15）！

如果你们需要任何其他信息，请告诉我！