Ruby on Rails error "cannot load such file -- less"

Question

I am fairly new to ruby on rails, I have been trying to use twitter-bootstrap as an asset, so I have included it in my Gemfile, bundled and it installs successfully. However I have noticed that it relies on certain dependencies that are not shown when I do the "bundle" command.

The dependences it needs

(1) Libv8
(2) Less
(3) Less-rails

Error message:

cannot load such file -- less
  (in c:/Sites/todo/app/assets/stylesheets/bootstrap_and_overrides.css.less)

[code]

Extracted source (around line #8):

5:   <!--[if lt IE 9]>
6:     <script src="http://html5shim.googlecode.com/svn/trunk/html5.js"     type="text/javascript"></script>
7:   <![endif]-->
8:   <%= stylesheet_link_tag    "application", :media => "all" %>
9:   <%= javascript_include_tag "application" %>
10:   <%= csrf_meta_tags %>
11:   <meta name="viewport" content="width=device-width, initial-scale=1.0">

[/code]

Trace
app/views/layouts/application.html.erb:8:in     `_app_views_layouts_application_html_erb__560528188_27183396'
app/controllers/lists_controller.rb:7:in `index'

I have noticed a lot of answers to this very question already, and have chosen the obvious solutions, but somehow I still get stuck, and would really appreciate some guidance.

Solution 1

I guess you are using sass instead of LESS.

Have you tried the twitter-bootstrap-rails gem?

gem "therubyracer"
gem "less-rails"
gem "twitter-bootstrap-rails"

https://github.com/seyhunak/twitter-bootstrap-rails

Solution 2

I simply needed to restart my server.

I had added the three gems listed above (less-rails, therubyracer, and twitter-bootstrap-rails, with Rails 3.2.13) while my local server was running, resulting in the problem seen above. So once I shut it down and restarted it again, everything loaded well.

Solution 3

You have to either update therubyracer or downgrade the twitter-bootstrap-rails gem down to version 2.1.7 which is the last known version that didn't have this issue.

Run either bundle update to update your gems or in your Gemfile make your twitter-bootstrap-rails gem look like this:

gem 'twitter-bootstrap-rails', '2.1.7'

Take a look at this issue:

https://github.com/seyhunak/twitter-bootstrap-rails/issues/465

This issue started happening on versions after 2.1.7 on twitter-bootstrap-rails.

Solution 4

If you are getting it under Windows this should help you therubyracer_for_windows

It helped me

Solution 5

perhaps you are on windows ... there is no libv8 for windows and no binary therubyracer because it depends on libv8

View more solutions

Comments

[Nicolas Brown]

This is the gem that i am using currently, however i dont have the gem therubyracer or less-rails

[Nicolas Brown]

I try to install libv8 but it keeps failing, and the therubyracer depends on it, and also the "less" depends on the "therubyracer"

[Helio Santos]

I guess that's it... I've followed the guide on the link and it worked fine. Like I've said, rails uses SASS instead of LESS. That's why the other two gems are required. (I am using rails 3)

[s2t2]

@NicolasBrown try uninstalling and re-installing... gem uninstall libv8 then bundle install will detect the dependency of therubyracer and will install libv8. And restart your server, as was mentioned in another post.

[max pleaner]

then why didnt you pick this as the correct answer?

[ipatch]

@CodeBiker, yeah a restart was required for my rails app as well.

[Andre Figueiredo]

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