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POTwitter bootstrap has Invalid CSS according to Rails 3.1 asset pipeline during precompilation?
 

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    <p>I created a brand new Rails 3.1 app. I added the twitter bootstrap CSS file in app/assets/stylesheets/bootstrap.min.css. Here is the relevant code</p> <p>app/assets/stylesheets/application.css (includes the tree, so bootstrap is included)</p> <pre><code>/* * This is a manifest file that'll automatically include all the stylesheets available in this directory * and any sub-directories. You're free to add application-wide styles to this file and they'll appear at * the top of the compiled file, but it's generally better to create a new file per style scope. *= require_self *= require_tree . */ </code></pre> <p>Gemfile (includes execjs and therubyracer for compile/compress)</p> <pre><code>group :development, :qa do gem 'execjs' gem 'therubyracer' end # Gems used only for assets and not required # in production environments by default. group :assets do gem 'sass-rails', '~&gt; 3.1.0' gem 'coffee-rails', '~&gt; 3.1.0' gem 'uglifier', '&gt;= 1.0.3' end </code></pre> <p>Then I run the rake task to precompile assets</p> <pre><code>rake assets:precompile </code></pre> <p>this fails with the following error</p> <pre><code>Invalid CSS after ".inputs-list li+": expected number or function, was "li" </code></pre> <p>that CSS is in the bootstrap file (".inputs-list li+li" is the selector).</p> <p>However, if I run </p> <pre><code>rake assets:precompile RAILS_ENV=development </code></pre> <p>now it works fine. Turns out that if I change config/environments/production.rb to not compress files:</p> <pre><code>config.assets.compress = false </code></pre> <p>then the original command works too (without specifying development environment). </p> <p>So, how do I track down the error? I can live with just turning off compression for now, but obviously something is wrong. Is it Rails? Sprockets? The Ruby Racer? Uglifier?</p>
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