vue 启动时-- cnpm run dev 报错

Question

请问各位大神，初学vue这个错怎么解决，我的执行步骤是：
windows vue-cli刚安装完。

1. 使用vue init webpack firstvue创建完项目

2. cnpm install 后使用 cnpm run dev可以正常运行

3. 连续两次ctrl+c关掉服务

4. 关闭cmd命令，重新打开找到项目，重新使用cnpm run dev运行就报错了
   

package.json代码如下：

{
  "name": "firstvue",
  "version": "1.0.0",
  "description": "A Vue.js project",
  "author": "",
  "private": true,
  "scripts": {
    "dev": "node build/dev-server.js",
    "build": "node build/build.js",
    "unit": "cross-env BABEL_ENV=test karma start test/unit/karma.conf.js --single-run",
    "e2e": "node test/e2e/runner.js",
    "test": "npm run unit && npm run e2e"
  },
  "dependencies": {
    "vue": "^2.2.2",
    "vue-router": "^2.2.0"
  },
  "devDependencies": {
    "autoprefixer": "^6.7.2",
    "babel-core": "^6.22.1",
    "babel-loader": "^6.2.10",
    "babel-plugin-transform-runtime": "^6.22.0",
    "babel-preset-env": "^1.2.1",
    "babel-preset-stage-2": "^6.22.0",
    "babel-register": "^6.22.0",
    "chalk": "^1.1.3",
    "connect-history-api-fallback": "^1.3.0",
    "copy-webpack-plugin": "^4.0.1",
    "css-loader": "^0.26.1",
    "eventsource-polyfill": "^0.9.6",
    "express": "^4.14.1",
    "extract-text-webpack-plugin": "^2.0.0",
    "file-loader": "^0.10.0",
    "friendly-errors-webpack-plugin": "^1.1.3",
    "function-bind": "^1.1.0",
    "html-webpack-plugin": "^2.28.0",
    "http-proxy-middleware": "^0.17.3",
    "webpack-bundle-analyzer": "^2.2.1",
    "cross-env": "^3.1.4",
    "karma": "^1.4.1",
    "karma-coverage": "^1.1.1",
    "karma-mocha": "^1.3.0",
    "karma-phantomjs-launcher": "^1.0.2",
    "karma-sinon-chai": "^1.2.4",
    "karma-sourcemap-loader": "^0.3.7",
    "karma-spec-reporter": "0.0.26",
    "karma-webpack": "^2.0.2",
    "lolex": "^1.5.2",
    "mocha": "^3.2.0",
    "chai": "^3.5.0",
    "sinon": "^1.17.7",
    "sinon-chai": "^2.8.0",
    "inject-loader": "^2.0.1",
    "babel-plugin-istanbul": "^3.1.2",
    "phantomjs-prebuilt": "^2.1.14",
    "chromedriver": "^2.27.2",
    "cross-spawn": "^5.0.1",
    "nightwatch": "^0.9.12",
    "selenium-server": "^3.0.1",
    "semver": "^5.3.0",
    "opn": "^4.0.2",
    "optimize-css-assets-webpack-plugin": "^1.3.0",
    "ora": "^1.1.0",
    "rimraf": "^2.6.0",
    "url-loader": "^0.5.7",
    "vue-loader": "^11.1.4",
    "vue-style-loader": "^2.0.0",
    "vue-template-compiler": "^2.2.4",
    "webpack": "^2.2.1",
    "webpack-dev-middleware": "^1.10.0",
    "webpack-hot-middleware": "^2.16.1",
    "webpack-merge": "^2.6.1"
  },
  "engines": {
    "node": ">= 4.0.0",
    "npm": ">= 3.0.0"
  },
  "browserslist": [
    "> 1%",
    "last 2 versions",
    "not ie <= 8"
  ]
}

Answer 1

webpack output.path配置出错，你配置的output.path不是一个绝对路径。
参考：https://webpack.js.org/config...