Gemfile

source 'http://rubygems.org'

gem 'aasm', '2.2.0'
gem 'activeresource', '2.3.11'
gem 'activesupport', '2.3.11'
gem 'acts-as-taggable-on', '2.0.6'
gem 'block_helpers', '0.3.3'
gem 'coderay', '0.9.7'
gem 'fcgi', '0.8.8'
gem 'hoe', '2.9.1'
gem 'holidays', '1.0.0'
gem 'i18n', '0.4.2'
gem 'icalendar', '1.1.5'
gem 'json', '1.5.1'
gem 'mysql', '2.8.1'
gem 'prawn', '0.8.4'
gem 'prawn-core', '0.8.4'
gem 'prawn-layout', '0.8.4'
gem 'prawn-security', '0.8.4'
gem 'rack', '1.0.1'
gem 'rake', '0.8.7'
gem 'rails', '2.3.11'
gem 'rmagick', '2.13.1'
gem 'rubytree', '0.5.2'

group :development, :test do
  gem 'rspec', '~>1.2.0'
  gem 'rspec-rails', '~>1.2.0'
end

With fixed Gemfile... Better error

#And that gives this error message:

Ξ code/bundleweird → bundle install
Fetching source index for http://rubygems.org/
Bundler could not find compatible versions for gem "rack":
  In Gemfile:
    rails (= 2.3.11) depends on
      rack (~> 1.1.0)

    rack (1.0.1)

#Which should at least put you in the right direction. :)

Yep, fixing that one now :)