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Editorial Team
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Asked: 2026-05-25T10:41:33+00:00

I made a basic rails app with a simple pages controller with an index

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I made a basic rails app with a simple pages controller with an index function and when I load the page I get:

ActionView::Template::Error (application.css isn't precompiled):
    2: <html>
    3: <head>
    4:   <title>Demo</title>
    5:   <%= stylesheet_link_tag    "application" %>
    6:   <%= javascript_include_tag "application" %>
    7:   <%= csrf_meta_tags %>
    8: </head>
  app/views/layouts/application.html.erb:5:in `_app_views_layouts_application_html_erb__43625033_88530400'

Gemfile

source 'http://rubygems.org'

gem 'rails', '3.1.0'

# Bundle edge Rails instead:
# gem 'rails',     :git => 'git://github.com/rails/rails.git'

gem 'sqlite3'

gem 'execjs'
gem 'therubyracer'

# Gems used only for assets and not required
# in production environments by default.
group :assets do
  gem 'sass-rails', "  ~> 3.1.0"
  gem 'coffee-rails', "~> 3.1.0"
  gem 'uglifier'
end

gem 'jquery-rails'

# Use unicorn as the web server
# gem 'unicorn'

# Deploy with Capistrano
# gem 'capistrano'

# To use debugger
# gem 'ruby-debug19', :require => 'ruby-debug'

group :test do
  # Pretty printed test output
  gem 'turn', :require => false
end
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1 Answer

  1. Editorial Team

    By default Rails assumes that you have your files precompiled in the production environment, if you want use live compiling (compile your assets during runtime) in production you must set the config.assets.compile to true.

    # config/environments/production.rb
...
config.assets.compile = true
...

    You can use this option to fallback to Sprockets when you are using precompiled assets but there are any missing precompiled files.

    If config.assets.compile option is set to false and there are missing precompiled files you will get an “AssetNoPrecompiledError” indicating the name of the missing file.

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