Twitter Bootstrap in Ruby on Rails

Question

I want to integrate twitter-boostrap in my Ruby on Rails project. For that i have written- gem "therubyracer" gem "less-rails" gem "twitter-bootstrap-rails" on my gemfile. And then bundle install in rails command prompt . After installing less-rails . This error is comming

Gem::Installer::ExtensionBuildError: ERROR:
Failed to build gem native extension` 
c:/row/Ruby200/bin/ruby.exe extconf.rb`
creating Makefile
The system cannot find the path specified.
The system cannot find the path specified.`
c:/row/Ruby200/lib/ruby/gems/2.0.0/gems/libv8-3.16.14.3/ext/libv8/builder.rb:58:
in `setup_python!': libv8 requires python 2 to be installed in order to build, b
ut it is currently not available (RuntimeError)
from c:/row/Ruby200/lib/ruby/gems/2.0.0/gems/libv8-3.16.14.3/ext/libv8/builder.rb:42:in `block in build_libv8!'
from c:/row/Ruby200/lib/ruby/gems/2.0.0/gems/libv8-3.16.14.3/ext/libv8/builder.rb:40:in `chdir'
from c:/row/Ruby200/lib/ruby/gems/2.0.0/gems/libv8-3.16.14.3/ext/libv8/builder.rb:40:in `build_libv8!'
from c:/row/Ruby200/lib/ruby/gems/2.0.0/gems/libv8-3.16.14.3/ext/libv8/location.rb:24:in `install!'
from extconf.rb:7:in `<main>'

Gem files will remain installed in c:/row/Ruby200/lib/ruby/gems/2.0.0/gems/libv8 -3.16.14.3 for inspection.
Results logged to c:/row/Ruby200/lib/ruby/gems/2.0.0/gems/libv8-3.16.14.3/ext/libv8/gem_make.out
An error occurred while installing libv8 (3.16.14.3), and Bundler cannotcontinue.
Make sure that `gem install libv8 -v '3.16.14.3'` succeeds before bundling.

Help. thanks

Answer 1

Remove

group :assets do 
end

But keep gems mentioned inside this group, then do bundle install.

gem 'therubyracer', :platforms => :ruby
gem 'less-rails'
gem 'devise'