无法读取null的属性“路径名”

Question

以前，我的Web应用程序（由React和https://github.com/dvajs/dva开发）运行良好。但是突然之间，它不再起作用了。

这是错误消息：

代码如下：

这是package.json：

{
  "name": "frontend",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@material-ui/core": "^4.9.8",
    "@microsoft/office-js-helpers": "^1.0.2",
    "@testing-library/jest-dom": "^4.2.4",
    "@testing-library/react": "^9.3.2",
    "@testing-library/user-event": "^7.1.2",
    "@types/react-stripe-elements": "^6.0.4",
    "@uifabric/react-cards": "^0.109.49",
    "axios": "^0.19.2",
    "color": "^3.1.2",
    "copy-to-clipboard": "^3.3.1",
    "cross-storage": "^1.0.0",
    "dva": "^2.4.1",
    "dva-model-creator": "^0.4.3",
    "formik": "^2.1.4",
    "lodash": "^4.17.15",
    "moment": "^2.24.0",
    "monaco-editor": "^0.20.0",
    "monaco-languageclient": "^0.13.0",
    "node-sass": "^4.13.1",
    "office-ui-fabric-core": "^11.0.0",
    "office-ui-fabric-react": "^7.105.4",
    "query-string": "^6.11.1",
    "react": "^16.13.1",
    "react-app-polyfill": "^1.0.6",
    "react-bootstrap": "^1.0.1",
    "react-dom": "^16.13.1",
    "react-monaco-editor": "^0.35.0",
    "react-scripts": "3.4.1",
    "react-stripe-elements": "^6.1.1",
    "redux-devtools-extension": "^2.13.8",
    "styled-components": "^5.0.1",
    "typescript": "^3.8.3",
    "yup": "^0.28.3"
  },
  "scripts": {
    "start": "SET PORT=8001 && react-scripts start",
    "start:https": " SET HTTPS=true && react-scripts start",
    "build": "react-scripts --max_old_space_size=8096 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": {
    "@types/color": "^3.0.1",
    "@types/cross-storage": "^0.8.29",
    "@types/jest": "^25.1.4",
    "@types/lodash": "^4.14.149",
    "@types/node": "^13.9.5",
    "@types/office-js": "^1.0.92",
    "@types/query-string": "^6.3.0",
    "@types/react": "^16.9.27",
    "@types/react-dom": "^16.9.5",
    "@types/react-redux": "^7.1.7",
    "@types/styled-components": "^5.0.1",
    "@types/yup": "^0.26.33",
    "css-loader": "^3.5.3",
    "style-loader": "^1.2.1"
  }
}

有人知道怎么了吗？