vue项目启动不了？

{
  "name": "todo-list",
  "version": "0.1.0",
  "private": true,
  "scripts": {
    "serve": "vue-cli-service serve",
    "build": "vue-cli-service build"
  },
  "dependencies": {
    "core-js": "^3.8.3",
    "vue": "^2.6.14"
  },
  "devDependencies": {
    "@vue/cli-plugin-babel": "~5.0.0",
    "@vue/cli-service": "~5.0.0",
    "sass": "^1.32.7",
    "sass-loader": "^12.0.0",
    "vue-template-compiler": "^2.6.14"
  },
  "browserslist": [
    "> 1%",
    "last 2 versions",
    "not dead"
  ]
}

vue项目启动失败了 是什么原因呢？package 文件配置没问题！

装依赖了吗？npm install

依赖和 启动命令对了吗