Unable to install twitter bootstrap

[kaiserkhan3]

c:\Dev\ng-fundamentals>npm install ngf-bootstrap --save
npm ERR! Windows_NT 10.0.15063
npm ERR! argv "C:\Program Files\nodejs\node.exe" "C:\Program Files\nodejs\node_modules\npm\bin\npm-cli.js" "install" "ngf-bootstrap" "--save"
npm ERR! node v8.11.3
npm ERR! npm v5.6.0

npm ERR! Class constructor cannot be invoked without 'new'
npm ERR!
npm ERR! If you need help, you may report this error at:
npm ERR! https://github.com/npm/npm/issues

npm ERR! Please include the following file with any support request:
npm ERR! c:\Dev\ng-fundamentals\npm-debug.log
NPM.Debug.log

[legodude17]

That's not your debug log, that appears to be your .gitignore. Try updating to the latest version of npm.