title: Laravel 5.4 mix npm run dev error
body: <p>So I have a laravel 5.4 project and when I run <code>npm install dev</code> I get the following error</p>
  
  <blockquote>
    <p>dev: node node_modules/cross-env/dist/bin/cross-env.js NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js`</p>
  </blockquote>
  
  <p>This is my package.json</p>
  
  <pre><code>{
      "private": true,
      "scripts": {
          "dev": "node node_modules/cross-env/dist/bin/cross-env.js NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js",
  
          "watch": "node node_modules/cross-env/dist/bin/cross-env.js NODE_ENV=development node_modules/webpack/bin/webpack.js --watch --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js",
          "watch-poll": "node node_modules/cross-env/dist/bin/cross-env.js NODE_ENV=development node_modules/webpack/bin/webpack.js --watch --watch-poll --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js",
  
          "hot": "node node_modules/cross-env/dist/bin/cross-env.js NODE_ENV=development node_modules/webpack-dev-server/bin/webpack-dev-server.js --inline --hot --config=node_modules/laravel-mix/setup/webpack.config.js",
          "production": "node node_modules/cross-env/dist/bin/cross-env.js NODE_ENV=production node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js"
      },
  
      "devDependencies": {
          "axios": "^0.15.3",
          "bootstrap-sass": "^3.3.7",
          "jquery": "^3.1.1",
          "laravel-elixir-webpack-react": "^1.0.1",
          "laravel-mix": "^0.8.1",
          "lodash": "^4.17.4",
          "react": "^15.4.2",
          "react-dom": "^15.4.2",
          "vue": "^2.1.10"
      }
  }
  </code></pre>
  
  <p>Why I get this error ?</p>