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I am trying to use twitter-bootstrail-rails gem to style my devise sign in pages and custom pages. I have followed the screencasts and included the required gem (gem ‘twitter-bootstrap-rails’

gem 'therubyracer', :platform => :ruby
# gem 'therubyracer', '~> 0.10.2'#therubyracer
gem 'libv8', ''

gem 'less-rails')in my gem file. I am on Windows 7.

All my gems are installed successfully installed but when i navigate to http://localhost:3000/users/sign_up or any page, I am getting this error.Kindly help me resolve this issue as i am struck with this for long time..

cannot load such file — v8
(in C:/Sites/konavsa/app/assets/stylesheets/bootstrap_and_overrides.css.less)
Extracted source (around line #6):


<%= stylesheet_link_tag    "application", :media => "all" %>
<%= javascript_include_tag "application" %>
<%= csrf_meta_tags %>
<meta name="viewport" content="width=device-width, initial-scale=1.0">



  1. Try this:

    gem 'libv8', '~>', :platform => :ruby
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  2. I had this error before and that made me switch ruby/rails development to linux. I still program in Windows, but i’m using Vagrant +
    VirtualBox to run the project on a linux environment.

    Unfortunately some (few) gems doesn’t work very well on Windows. So I made the switch. Anyway, that’s some things that you can try before “making the move” (although I suggest that you do it anyway, so you can isolate your running environment while still using your favorite IDE at Windows/OS X):

    1. Try to install nodeJS. Sometimes it solves the problem, although I cannot guarantee nothing.
    2. Don’t use LESS. Use SASS instead, since it’s Rails’ default for the asset pipeline.
    3. Again. Switch to Vagrant +
      VirtualBox or even Docker. There are plenty of tutorials how to setup your project using them.
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  3. On Windows, for Twitter bootstrap without therubyracer gem on windows

    Try add this lines on your Gemfile

    # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
    gem 'bootstrap-sass-extras'
    gem "twitter-bootstrap-rails"

    type bundle install

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