Jekyll serve nie działa: wygląda na to, że nie masz zainstalowanych pigmentów lub jednej z jego zależności

Configuration file: /Users/andrechristoga/Documents/type-theme/_config.yml
       Deprecation: You appear to have pagination turned on, but you haven't included the `jekyll-paginate` gem. Ensure you have `gems: [jekyll-paginate]` in your configuration file.
            Source: /Users/andrechristoga/Documents/type-theme
       Destination: /Users/andrechristoga/Documents/type-theme/_site
 Incremental build: disabled. Enable with --incremental
      Generating... 
  Dependency Error: Yikes! It looks like you don't have pygments or one of its dependencies installed. In order to use Jekyll as currently configured, you'll need to install this gem. The full error message from Ruby is: 'cannot load such file -- pygments' If you run into trouble, you can find helpful resources at http://jekyllrb.com/help/! 
  Liquid Exception: pygments in /Users/andrechristoga/Documents/type-theme/_posts/2014-11-28-markdown-and-html.md
             ERROR: YOUR SITE COULD NOT BE BUILT:
                    ------------------------------------
                    pygments

Są to wiadomości, kiedy wpisuję jekyll serve.