title: Error with: npm run dev
body: <blockquote>
    <p>@ dev /home/eduardo/blog2
    npm run development</p>
    
    <p>@ development /home/eduardo/blog2
    cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js</p>
  </blockquote>
  
  <p>sh: 1: cross-env: not found</p>
  
  <p>npm ERR! Linux 4.15.0-29-generic
  npm ERR! argv "/usr/bin/node" "/usr/bin/npm" "run" "development"
  npm ERR! node v8.10.0
  npm ERR! npm  v3.5.2
  npm ERR! file sh
  npm ERR! code ELIFECYCLE
  npm ERR! errno ENOENT
  npm ERR! syscall spawn
  npm ERR! @ development: <code>cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js</code>
  npm ERR! spawn ENOENT
  npm ERR! 
  npm ERR! Failed at the @ development script '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! Make sure you have the latest version of node.js and npm installed.
  npm ERR! If you do, this is most likely a problem with the  package,
  npm ERR! not with npm itself.
  npm ERR! Tell the author that this fails on your system:
  npm ERR!     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! You can get information on how to open an issue for this project with:
  npm ERR!     npm bugs 
  npm ERR! Or if that isn't available, you can get their info via:
  npm ERR!     npm owner ls 
  npm ERR! There is likely additional logging output above.</p>
  
  <p>npm ERR! Please include the following file with any support request:
  npm ERR!     /home/eduardo/blog2/npm-debug.log</p>
  
  <p>npm ERR! Linux 4.15.0-29-generic
  npm ERR! argv "/usr/bin/node" "/usr/bin/npm" "run" "dev"
  npm ERR! node v8.10.0
  npm ERR! npm  v3.5.2
  npm ERR! code ELIFECYCLE
  npm ERR! @ dev: <code>npm run development</code>
  npm ERR! Exit status 1
  npm ERR! 
  npm ERR! Failed at the @ dev script 'npm run development'.
  npm ERR! Make sure you have the latest version of node.js and npm installed.
  npm ERR! If you do, this is most likely a problem with the  package,
  npm ERR! not with npm itself.
  npm ERR! Tell the author that this fails on your system:
  npm ERR!     npm run development
  npm ERR! You can get information on how to open an issue for this project with:
  npm ERR!     npm bugs 
  npm ERR! Or if that isn't available, you can get their info via:
  npm ERR!     npm owner ls 
  npm ERR! There is likely additional logging output above.</p>
  
  <p>This is the error im getting while trying to install npm on laravel.</p>
  
  <p>I already installed node and yarn, any help?</p>