Using less (2.2.1) raises an error requiring therubyracer (can't install therubyracer on windows)

Question

I've been working to get twitter-bootstrap-rails gem working on my windows machine and ran into an error attempting to install 'therubyracer' gem which is a dependency of older version of the less gem.

I think upgraded to less 2.2.1 which is not dependent on therubyracer however in spite of that it seems to think I still need therubyracer installed. Here is the output of the error I get when I try to start my rails server 'rails s'.

$ rails s
[WARNING] Please install gem 'therubyracer' to use Less.
c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `require': cannot load such file -- v8 (LoadError)
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `block in require'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:236:in `load_dependency'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `require'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/less-2.2.2/lib/less/java_script/v8_context.rb:2:in `<top (required)>'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `require'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `block in require'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:236:in `load_dependency'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `require'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/less-2.2.2/lib/less/java_script.rb:9:in `default_context_wrapper'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/less-2.2.2/lib/less/java_script.rb:17:in `context_wrapper'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/less-2.2.2/lib/less/loader.rb:10:in `initialize'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/less-2.2.2/lib/less.rb:14:in `new'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/less-2.2.2/lib/less.rb:14:in `<module:Less>'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/less-2.2.2/lib/less.rb:9:in `<top (required)>'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `require'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `block in require'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:236:in `load_dependency'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `require'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/less-rails-2.2.3/lib/less/rails.rb:6:in `<top (required)>'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `require'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `block in require'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:236:in `load_dependency'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `require'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/less-rails-2.2.3/lib/less-rails.rb:1:in `<top (required)>'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `require'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `block in require'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:236:in `load_dependency'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `require'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/twitter-bootstrap-rails-2.1.2/lib/twitter-bootstrap-rails.rb:9:in `<top (required)>'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22/lib/bundler/runtime.rb:68:in `require'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22/lib/bundler/runtime.rb:68:in `block (2 levels) in require'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22/lib/bundler/runtime.rb:66:in `each'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22/lib/bundler/runtime.rb:66:in `block in require'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22/lib/bundler/runtime.rb:55:in `each'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22/lib/bundler/runtime.rb:55:in `require'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22/lib/bundler.rb:122:in `require'
    from C:/Sites/alliance/config/application.rb:9:in `<top (required)>'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.8/lib/rails/commands.rb:53:in `require'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.8/lib/rails/commands.rb:53:in `block in <top (required)>'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.8/lib/rails/commands.rb:50:in `tap'
    from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.8/lib/rails/commands.rb:50:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

Here are my Gemfile and Gemfile.lock files. Can anyone help me figure out how to tell my app that it doesn't need 'therubyracer' installed?

---- Gemfile ----

source 'https://rubygems.org'

gem 'rails',   '~> 3.2.3'
gem 'jquery-rails'
gem 'haml-rails'
gem 'simple_form'
gem 'decent_exposure'
gem "devise", :git => "git://github.com/plataformatec/devise.git"
gem 'cancan'
gem 'prawn'
gem 'ransack'
gem 'eventmachine', '= 1.0.0.rc.4'
gem 'therubyracer', :platforms => :ruby

group :assets do
  gem 'execjs'
  gem 'sass-rails',   '~> 3.2.3'
  gem 'coffee-rails', '~> 3.2.1'
  gem 'bootstrap-sass'
  gem 'twitter-bootstrap-rails' 
  gem 'uglifier', '>= 1.0.3'
end

group :development, :test do
  gem 'debugger'
  gem 'rails_best_practices'
  gem 'factory_girl_rails', '~> 2.0'
  gem 'sqlite3'
  gem 'simplecov', require: false
  gem 'rspec-rails'
  gem 'rspec-instafail'
  gem 'rspec-steps'
  gem 'factory_girl_rails', '~> 2.0'
  gem "capybara"
  gem "selenium-webdriver"
  gem 'launchy' # provides save_and_open_page
  gem 'fuubar'

  gem 'database_cleaner'
  gem 'rantly'
  gem 'heroku'
  gem 'rb-fsevent' #, :require => false if RUBY_PLATFORM =~ /darwin/i
  gem 'guard-rspec'
end

group :production do
  gem 'mysql2'
  gem 'thin'
  gem 'pg'
end

---- Gemfile.lock ----

GIT
  remote: git://github.com/plataformatec/devise.git
  revision: f7dd59839cd39ed3c57948d37e8a95c697c14647
  specs:
    devise (2.1.2)
      bcrypt-ruby (~> 3.0)
      orm_adapter (~> 0.1)
      railties (~> 3.1)
      warden (~> 1.2.1)

GEM
  remote: https://rubygems.org/
  specs:
    Ascii85 (1.0.1)
    actionmailer (3.2.8)
      actionpack (= 3.2.8)
      mail (~> 2.4.4)
    actionpack (3.2.8)
      activemodel (= 3.2.8)
      activesupport (= 3.2.8)
      builder (~> 3.0.0)
      erubis (~> 2.7.0)
      journey (~> 1.0.4)
      rack (~> 1.4.0)
      rack-cache (~> 1.2)
      rack-test (~> 0.6.1)
      sprockets (~> 2.1.3)
    activemodel (3.2.8)
      activesupport (= 3.2.8)
      builder (~> 3.0.0)
    activerecord (3.2.8)
      activemodel (= 3.2.8)
      activesupport (= 3.2.8)
      arel (~> 3.0.2)
      tzinfo (~> 0.3.29)
    activeresource (3.2.8)
      activemodel (= 3.2.8)
      activesupport (= 3.2.8)
    activesupport (3.2.8)
      i18n (~> 0.6)
      multi_json (~> 1.0)
    addressable (2.3.2)
    arel (3.0.2)
    awesome_print (1.0.2)
    bcrypt-ruby (3.0.1-x86-mingw32)
    bootstrap-sass (2.1.0.0)
    builder (3.0.1)
    cancan (1.6.8)
    capybara (1.1.2)
      mime-types (>= 1.16)
      nokogiri (>= 1.3.3)
      rack (>= 1.0.0)
      rack-test (>= 0.5.4)
      selenium-webdriver (~> 2.0)
      xpath (~> 0.1.4)
    childprocess (0.3.5)
      ffi (~> 1.0, >= 1.0.6)
    coffee-rails (3.2.2)
      coffee-script (>= 2.2.0)
      railties (~> 3.2.0)
    coffee-script (2.2.0)
      coffee-script-source
      execjs
    coffee-script-source (1.3.3)
    colored (1.2)
    columnize (0.3.6)
    commonjs (0.2.6)
    daemons (1.1.9)
    database_cleaner (0.8.0)
    debugger (1.2.0)
      columnize (>= 0.3.1)
      debugger-linecache (~> 1.1.1)
      debugger-ruby_core_source (~> 1.1.3)
    debugger-linecache (1.1.2)
      debugger-ruby_core_source (>= 1.1.1)
    debugger-ruby_core_source (1.1.3)
    decent_exposure (1.0.2)
    diff-lcs (1.1.3)
    erubis (2.7.0)
    eventmachine (1.0.0.rc.4-x86-mingw32)
    excon (0.16.2)
    execjs (1.4.0)
      multi_json (~> 1.0)
    factory_girl (3.0.0)
      activesupport (>= 3.0.0)
    factory_girl_rails (2.0.0)
      factory_girl (~> 3.0.0)
      railties (>= 3.0.0)
    ffi (1.1.5)
    fuubar (1.0.0)
      rspec (~> 2.0)
      rspec-instafail (~> 0.2.0)
      ruby-progressbar (~> 0.0.10)
    guard (1.3.2)
      listen (>= 0.4.2)
      thor (>= 0.14.6)
    guard-rspec (1.2.1)
      guard (>= 1.1)
    haml (3.1.7)
    haml-rails (0.3.4)
      actionpack (~> 3.0)
      activesupport (~> 3.0)
      haml (~> 3.0)
      railties (~> 3.0)
    hashery (2.0.1)
    heroku (2.31.2)
      heroku-api (~> 0.3.4)
      launchy (>= 0.3.2)
      netrc (~> 0.7.7)
      rest-client (~> 1.6.1)
      rubyzip
    heroku-api (0.3.4)
      excon (~> 0.16.1)
    hike (1.2.1)
    i18n (0.6.1)
    journey (1.0.4)
    jquery-rails (2.1.2)
      railties (>= 3.1.0, < 5.0)
      thor (~> 0.14)
    json (1.7.5)
    launchy (2.1.2)
      addressable (~> 2.3)
    less (2.2.2)
      commonjs (~> 0.2.6)
    less-rails (2.2.3)
      actionpack (>= 3.1)
      less (~> 2.2.0)
    libwebsocket (0.1.5)
      addressable
    listen (0.5.0)
    mail (2.4.4)
      i18n (>= 0.4.0)
      mime-types (~> 1.16)
      treetop (~> 1.4.8)
    mime-types (1.19)
    multi_json (1.3.6)
    mysql2 (0.3.11-x86-mingw32)
    netrc (0.7.7)
    nokogiri (1.5.5-x86-mingw32)
    orm_adapter (0.4.0)
    pdf-reader (1.2.0)
      Ascii85 (~> 1.0.0)
      hashery (~> 2.0)
      ruby-rc4
    pg (0.14.1-x86-mingw32)
    polyamorous (0.5.0)
      activerecord (~> 3.0)
    polyglot (0.3.3)
    prawn (0.12.0)
      pdf-reader (>= 0.9.0)
      ttfunk (~> 1.0.2)
    progressbar (0.11.0)
    rack (1.4.1)
    rack-cache (1.2)
      rack (>= 0.4)
    rack-ssl (1.3.2)
      rack
    rack-test (0.6.1)
      rack (>= 1.0)
    rails (3.2.8)
      actionmailer (= 3.2.8)
      actionpack (= 3.2.8)
      activerecord (= 3.2.8)
      activeresource (= 3.2.8)
      activesupport (= 3.2.8)
      bundler (~> 1.0)
      railties (= 3.2.8)
    rails_best_practices (1.10.1)
      activesupport
      awesome_print
      colored
      erubis
      i18n
      progressbar
      sexp_processor
    railties (3.2.8)
      actionpack (= 3.2.8)
      activesupport (= 3.2.8)
      rack-ssl (~> 1.3.2)
      rake (>= 0.8.7)
      rdoc (~> 3.4)
      thor (>= 0.14.6, < 2.0)
    rake (0.9.2.2)
    ransack (0.7.0)
      actionpack (~> 3.0)
      activerecord (~> 3.0)
      polyamorous (~> 0.5.0)
    rantly (0.3.1)
    rb-fsevent (0.9.1)
    rdoc (3.12)
      json (~> 1.4)
    rest-client (1.6.7)
      mime-types (>= 1.16)
    rspec (2.11.0)
      rspec-core (~> 2.11.0)
      rspec-expectations (~> 2.11.0)
      rspec-mocks (~> 2.11.0)
    rspec-core (2.11.1)
    rspec-expectations (2.11.3)
      diff-lcs (~> 1.1.3)
    rspec-instafail (0.2.4)
    rspec-mocks (2.11.2)
    rspec-rails (2.11.0)
      actionpack (>= 3.0)
      activesupport (>= 3.0)
      railties (>= 3.0)
      rspec (~> 2.11.0)
    rspec-steps (0.0.8)
      rspec (>= 2.6)
    ruby-progressbar (0.0.10)
    ruby-rc4 (0.1.5)
    rubyzip (0.9.9)
    sass (3.2.1)
    sass-rails (3.2.5)
      railties (~> 3.2.0)
      sass (>= 3.1.10)
      tilt (~> 1.3)
    selenium-webdriver (2.25.0)
      childprocess (>= 0.2.5)
      libwebsocket (~> 0.1.3)
      multi_json (~> 1.0)
      rubyzip
    sexp_processor (4.0.1)
    simple_form (2.0.2)
      actionpack (~> 3.0)
      activemodel (~> 3.0)
    simplecov (0.6.4)
      multi_json (~> 1.0)
      simplecov-html (~> 0.5.3)
    simplecov-html (0.5.3)
    sprockets (2.1.3)
      hike (~> 1.2)
      rack (~> 1.0)
      tilt (~> 1.1, != 1.3.0)
    sqlite3 (1.3.6-x86-mingw32)
    thin (1.4.1)
      daemons (>= 1.0.9)
      eventmachine (>= 0.12.6)
      rack (>= 1.0.0)
    thor (0.16.0)
    tilt (1.3.3)
    treetop (1.4.10)
      polyglot
      polyglot (>= 0.3.1)
    ttfunk (1.0.3)
    twitter-bootstrap-rails (2.1.2)
      actionpack (>= 3.1)
      less-rails (~> 2.2.3)
      railties (>= 3.1)
    tzinfo (0.3.33)
    uglifier (1.3.0)
      execjs (>= 0.3.0)
      multi_json (~> 1.0, >= 1.0.2)
    warden (1.2.1)
      rack (>= 1.0)
    xpath (0.1.4)
      nokogiri (~> 1.3)

PLATFORMS
  x86-mingw32

DEPENDENCIES
  bootstrap-sass
  cancan
  capybara
  coffee-rails (~> 3.2.1)
  database_cleaner
  debugger
  decent_exposure
  devise!
  eventmachine (= 1.0.0.rc.4)
  execjs
  factory_girl_rails (~> 2.0)
  fuubar
  guard-rspec
  haml-rails
  heroku
  jquery-rails
  launchy
  mysql2
  pg
  prawn
  rails (~> 3.2.3)
  rails_best_practices
  ransack
  rantly
  rb-fsevent
  rspec-instafail
  rspec-rails
  rspec-steps
  sass-rails (~> 3.2.3)
  selenium-webdriver
  simple_form
  simplecov
  sqlite3
  therubyracer
  thin
  twitter-bootstrap-rails
  uglifier (>= 1.0.3)

Answer 1

I'd highly recommend you follow Daniel Kehoe's excellent: https://github.com/RailsApps/rails3-bootstrap-devise-cancan if you aren't already.

About the only suspicious thing I can see in your Gemfile is that is has 'rubyracer' in it. Why is that there? Try removing it. Don't forget to bundle install whenever you make any changes, of course.