title: In laravel npm run dev errors:
body: <p>I have next errors output running npm command for my laravel 5.6 with bootstrap project:</p>
  
  <pre><code>$ npm run dev
  
  &gt; @ dev /mnt/_work_sdb8/wwwroot/lar/B4test
  &gt; npm run development
  
  
  &gt; @ development /mnt/_work_sdb8/wwwroot/lar/B4test
  &gt; cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js
  
  sh: 1: cross-env: not found
  npm ERR! file sh
  npm ERR! code ELIFECYCLE
  npm ERR! errno ENOENT
  npm ERR! syscall spawn
  npm ERR! @ development: `cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js`
  npm ERR! spawn ENOENT
  npm ERR! 
  npm ERR! Failed at the @ development script.
  npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
  
  npm ERR! A complete log of this run can be found in:
  npm ERR!     /home/serge/.npm/_logs/2018-04-25T10_54_37_776Z-debug.log
  npm ERR! code ELIFECYCLE
  npm ERR! errno 1
  npm ERR! @ dev: `npm run development`
  npm ERR! Exit status 1
  npm ERR! 
  npm ERR! Failed at the @ dev script.
  npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
  
  npm ERR! A complete log of this run can be found in:
  npm ERR!     /home/serge/.npm/_logs/2018-04-25T10_54_37_794Z-debug.log
  </code></pre>
  
  <p>File /home/serge/.npm/_logs/2018-04-25T10_54_37_776Z-debug.log has:</p>
  
  <pre><code>0 info it worked if it ends with ok
  1 verbose cli [ '/usr/bin/node', '/usr/bin/npm', 'run', 'development' ]
  2 info using npm@6.0.0
  3 info using node@v9.11.1
  4 verbose run-script [ 'predevelopment', 'development', 'postdevelopment' ]
  5 info lifecycle @~predevelopment: @
  6 info lifecycle @~development: @
  7 verbose lifecycle @~development: unsafe-perm in lifecycle true
  8 verbose lifecycle @~development: PATH: /usr/lib/node_modules/npm/node_modules/npm-lifecycle/node-gyp-bin:/mnt/_work_sdb8/wwwroot/lar/B4test/node_modules/.bin:/usr/lib/node_modules/npm/node_modules/npm-lifecycle/node-gyp-bin:/mnt/_work_sdb8/wwwroot/lar/B4test/node_modules/.bin:/home/serge/.composer/vendor/bin:/home/serge/.composer/vendor/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:~/.composer/vendor/bin
  9 verbose lifecycle @~development: CWD: /mnt/_work_sdb8/wwwroot/lar/B4test
  10 silly lifecycle @~development: Args: [ '-c',
  10 silly lifecycle   'cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js' ]
  11 info lifecycle @~development: Failed to exec development script
  12 verbose stack Error: @ development: `cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js`
  12 verbose stack spawn ENOENT
  12 verbose stack     at ChildProcess.&lt;anonymous&gt; (/usr/lib/node_modules/npm/node_modules/npm-lifecycle/lib/spawn.js:48:18)
  12 verbose stack     at ChildProcess.emit (events.js:180:13)
  12 verbose stack     at maybeClose (internal/child_process.js:936:16)
  12 verbose stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:220:5)
  13 verbose pkgid @
  14 verbose cwd /mnt/_work_sdb8/wwwroot/lar/B4test
  15 verbose Linux 4.13.0-38-generic
  16 verbose argv "/usr/bin/node" "/usr/bin/npm" "run" "development"
  17 verbose node v9.11.1
  18 verbose npm  v6.0.0
  19 error file sh
  20 error code ELIFECYCLE
  21 error errno ENOENT
  22 error syscall spawn
  23 error @ development: `cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js`
  23 error spawn ENOENT
  24 error Failed at the @ development script.
  24 error This is probably not a problem with npm. There is likely additional logging output above.
  25 verbose exit [ 1, true ]
  </code></pre>
  
  <p>In composer.json :</p>
  
  <pre><code>{
      "name": "laravel/laravel",
      "description": "The Laravel Framework.",
      "keywords": ["framework", "laravel"],
      "license": "MIT",
      "type": "project",
      "require": {
          "php": "^7.1.3",
          "fideloper/proxy": "^4.0",
          "laravel/framework": "5.6.*",
          "components/highlightjs": "^9.12",
          "doctrine/dbal": "^2.6",
          "intervention/image": "^2.4",
          "laracasts/utilities": "^3.0",
          "laravel/tinker": "~1.0",
          "nwidart/laravel-modules": "^3.0",
          "pusher/pusher-php-server": "^3.0",
          "spatie/laravel-backup": "^5.1",
          "wboyz/laravel-enum": "^0.2.1"
      },
      "require-dev": {
          "filp/whoops": "^2.0",
          "fzaninotto/faker": "^1.7",
          "mockery/mockery": "^1.0",
          "nunomaduro/collision": "^2.0",
          "phpunit/phpunit": "^7.0",
          "barryvdh/laravel-debugbar": "^3.1",
          "laravel/dusk": "~3.0"
      },
      "autoload": {
          "classmap": [
              "database/seeds",
              "database/factories"
          ],
          "psr-4": {
              "App\\": "app/",
              "Modules\\": "Modules/"
          }
      },
      "autoload-dev": {
          "psr-4": {
              "Tests\\": "tests/"
          }
      },
      "extra": {
          "laravel": {
              "dont-discover": [
              ]
          }
      },
      "scripts": {
          "post-root-package-install": [
              "@php -r \"file_exists('.env') || copy('.env.example', '.env');\""
          ],
          "post-create-project-cmd": [
              "@php artisan key:generate"
          ],
          "post-autoload-dump": [
              "Illuminate\\Foundation\\ComposerScripts::postAutoloadDump",
              "@php artisan package:discover"
          ]
      },
      "config": {
          "preferred-install": "dist",
          "sort-packages": true,
          "optimize-autoloader": true
      },
      "minimum-stability": "dev",
      "prefer-stable": true
  }
  </code></pre>
  
  <p>In package.json :</p>
  
  <pre><code>{
      "private": true,
      "scripts": {
          "dev": "npm run development",
          "development": "cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js",
          "watch": "npm run development -- --watch",
          "watch-poll": "npm run watch -- --watch-poll",
          "hot": "cross-env NODE_ENV=development node_modules/webpack-dev-server/bin/webpack-dev-server.js --inline --hot --config=node_modules/laravel-mix/setup/webpack.config.js",
          "prod": "npm run production",
          "production": "cross-env NODE_ENV=production node_modules/webpack/bin/webpack.js --no-progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js"
      },
      "devDependencies": {
          "axios": "^0.18",
          "bootstrap": "^4.0.0",
          "popper.js": "^1.12",
          "cross-env": "^5.1",
          "jquery": "^3.2",
          "laravel-mix": "^2.0",
          "lodash": "^4.17.4",
          "vue": "^2.5.7",
          "vue-template-compiler": "^2.5.16",
          "vue2-collapse": "^1.0.11"
      },
      "dependencies": {
          "element-ui": "^2.3.6",
          "font-awesome": "^4.7.0",
          "fullcalendar": "^3.9.0",
          "highlight.js": "^9.12.0",
          "laravel-echo": "^1.3.5",
          "marked": "^0.3.19",
          "pusher-js": "^4.2.2",
          "v-toaster": "^1.0.3",
          "vee-validate": "^2.0.6",
          "vee-validate-laravel": "^1.0.1",
          "vue-bootstrap-datetimepicker": "^4.1.3",
          "vue-chat-scroll": "^1.2.1",
          "vue-fullcalendar": "^1.0.9",
          "vue-js-popover": "^1.1.7",
          "vue-moment": "^3.2.0",
          "vue-mouse-menu": "^1.1.0",
          "vue-nl2br": "0.0.5",
          "vue-notify-me": "^1.1.0",
          "vue-popperjs": "^1.2.6",
          "vue-router": "^3.0.1",
          "vue-select": "^2.4.0",
          "vue-simple-calendar": "^2.2.0",
          "vue-timeago": "^3.4.4",
          "vuejs-datepicker": "^0.9.29"
      }
  }
  </code></pre>
  
  <p>Can you give a hint what could raize an error and how to fix it ?</p>
  
  <p>Some error in config files or what?</p>
  
  <p>Thank you very much!</p>