Tools.rb:328:in `require': cannot load such file -- JSON (LoadError)

Hi there,

I am trying to get dashing to work well. Please let me know what
system details will be helpful to post.

root@ce-lab1:~/sweet_dashboard_project# ruby -v
ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-linux]

here is my Gemfile:

:~/sweet_dashboard_project# cat Gemfile
source ‘

gem ‘json’
require ‘rubygems’
require ‘json’

gem ‘dashing’

Remove this if you don’t need a twitter widget.

gem ‘twitter’

gem ‘execjs’
gem ‘therubyracer’
gem ‘rest-client’

Any clues?