title: blueprint/screen.css isn't precompiled
body: <p>I've been following along Michael Hartl's excellent RoR Tutorial, but I'm using RoR 3.1. I am a newbie to RoR 3.1 and need help related to assets pipeline. Here is my problem:</p>
  
  <p>Before continuing to section 5.3, I thought I'd like to push to Heroku and see how things develop. To my surprise "GET /" results in error 500. Everything went OK in my local-development-environment. I then tried running my local sample_app under production-environment (<code>rails s -e production</code>). Same result, error 500:</p>
  
  <pre><code>Sprockets::Helpers::RailsHelper::AssetPaths::AssetNotPrecompiledError in Pages#home
  
  Showing /Users/john/Projects/sample_app/app/views/layouts/_stylesheets.html.erb where line #4 raised:
  
  blueprint/screen.css isn't precompiled
  </code></pre>
  
  <p>Supporting info:</p>
  
  <ol>
  <li>I put blueprint CSS directory under vendor/assets/stylesheets.</li>
  <li><p>I followed Michael's section 13.1.4 advice and have the following as my app/views/layouts/application.html.erb:</p>
  
  <pre><code>&lt;!DOCTYPE html&gt;
  &lt;html&gt;
    &lt;head&gt;
      &lt;title&gt;&lt;%= title %&gt;&lt;/title&gt;
      &lt;%= render 'layouts/stylesheets' %&gt;
      &lt;%= stylesheet_link_tag "application" %&gt;
      &lt;%= javascript_include_tag "application" %&gt;
      &lt;%= csrf_meta_tags %&gt;
    &lt;/head&gt;
    &lt;body&gt;
      &lt;div class="container"&gt;
        &lt;%= render 'layouts/header' %&gt;
        &lt;section class="round"&gt;
          &lt;%= yield %&gt;
        &lt;/section&gt;
        &lt;%= render 'layouts/footer' %&gt;
      &lt;/div&gt;
    &lt;/body&gt;
  &lt;/html&gt;
  </code></pre></li>
  <li><p>Content of app/views/layouts/_stylesheets.html.erb:</p>
  
  <pre><code>&lt;!--[if lt IE 9]&gt;
  &lt;script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"&gt;&lt;/script&gt;
  &lt;![endif]--&gt;
  &lt;%= stylesheet_link_tag 'blueprint/screen', :media =&gt; 'screen' %&gt;
  &lt;%= stylesheet_link_tag 'blueprint/print',  :media =&gt; 'print' %&gt;
  &lt;!--[if lt IE 8]&gt;&lt;%= stylesheet_link_tag 'blueprint/ie' %&gt;&lt;![endif]--&gt;
  </code></pre></li>
  <li><p>I have run bundle exec rake assets:precompile.</p></li>
  <li><p>Content of public/assets/manifest.yml:</p>
  
  <pre><code>---
  logo.png: logo-8e0a5ad292fbb13a2b07e68fa3995406.png
  rails.png: rails-bd9ad5a560b5a3a7be0808c5cd76a798.png
  blueprint/plugins/buttons/icons/cross.png: blueprint/plugins/buttons/icons/cross-2ebcd25368006d1b7b0c5b7d6b523ab3.png
  blueprint/plugins/buttons/icons/key.png: blueprint/plugins/buttons/icons/key-55237526967cbcab3e8cfb12f0029d88.png
  blueprint/plugins/buttons/icons/tick.png: blueprint/plugins/buttons/icons/tick-3f5fc1f52b505b93f88263e0432d25ce.png
  blueprint/plugins/buttons/readme.txt: blueprint/plugins/buttons/readme-3ff7f5dbb0288d71f70682fdbe9d86ec.txt
  blueprint/plugins/fancy-type/readme.txt: blueprint/plugins/fancy-type/readme-e7ed185d1a9f23256d418ab929b464d9.txt
  blueprint/plugins/link-icons/icons/doc.png: blueprint/plugins/link-icons/icons/doc-b071fd74b88ff38cda8360a53f493013.png
  blueprint/plugins/link-icons/icons/email.png: blueprint/plugins/link-icons/icons/email-28104e72b3418737d4b9b329c12ec358.png
  blueprint/plugins/link-icons/icons/external.png: blueprint/plugins/link-icons/icons/external-ee6d976ddb80125fafe1a33c6f8aed10.png
  blueprint/plugins/link-icons/icons/feed.png: blueprint/plugins/link-icons/icons/feed-59bc8604661681639d25cb7015a32c38.png
  blueprint/plugins/link-icons/icons/im.png: blueprint/plugins/link-icons/icons/im-afeeb6e0b652c1edb1441bf0fb428596.png
  blueprint/plugins/link-icons/icons/lock.png: blueprint/plugins/link-icons/icons/lock-d73c4b3b57ce72cb6dbd8b265507ff75.png
  blueprint/plugins/link-icons/icons/pdf.png: blueprint/plugins/link-icons/icons/pdf-c4c543e5103a8516839a7846b91e1ac4.png
  blueprint/plugins/link-icons/icons/visited.png: blueprint/plugins/link-icons/icons/visited-fb2370448bc4ea5d079e963a8c0d900b.png
  blueprint/plugins/link-icons/icons/xls.png: blueprint/plugins/link-icons/icons/xls-5399729cd31dffc492a04b3805cd0be1.png
  blueprint/plugins/link-icons/readme.txt: blueprint/plugins/link-icons/readme-42c02030199cd36a671d4b623cb4dc36.txt
  blueprint/plugins/rtl/readme.txt: blueprint/plugins/rtl/readme-8d11bf76e19fb3fc7dbc6c2ddb54b92d.txt
  blueprint/src/grid.png: blueprint/src/grid-973add038ed86febca85f03e8b35b94a.png
  jquery-ui.min.js: jquery-ui-7e33882a28fc84ad0e0e47e46cbf901c.min.js
  jquery.min.js: jquery-8a50feed8d29566738ad005e19fe1c2d.min.js
  application.js: application-a552e1db33b8be6a42eedf1261916f3c.js
  application.css: application-214e0c0742f20b334e8a7776e0a4c71d.css
  </code></pre></li>
  <li><p>I don't see blueprint/screen.css in manifest.yml.</p></li>
  </ol>
  
  <p>What am I missing?</p>