Grunt task grunt-contrib-compass not working on windows

I started working on an existing project that used “grunt-contrib-compass”.

Running “concurrent:server” (concurrent) task
Warning: Running “compass:server” (compass) task
Warning: not found: compass Use –force to continue.

After going in circles with installing npm packages, uninstalling npm packages, I realised the problem was this library is dependent on Ruby.

Install ruby:

Using ruby you need to install gems

gem install sass
gem install compass