title: Symfony2 & Assetic: Invalid configuration for path "assetic.bundles.0": "AcmeSiteBundle" is not a valid bundle
body: <p>I'm working on a project given to me by another developer.  My task is to convert hard-coded asset references to assetic references.  When I try to run <code>app/console assets:install</code> I get the following error:</p>
  
  <blockquote>
    <p>[Symfony\Component\Config\Definition\Exception\InvalidConfigurationException]<br>
      Invalid configuration for path "assetic.bundles.0": "AcmeSiteBundle" is not a valid bundle.</p>
  </blockquote>
  
  <p>I noticed that there was no directory for that bundle in <code>web/bundles</code>, so I simply ran <code>mkdir acmesite</code> to create it.  Unfortunately, the problem persists.</p>
  
  <p>My <strong>config.yml</strong> looks like:</p>
  
  <pre><code># Assetic Configuration
  assetic:
      debug:          %kernel.debug%
      use_controller: false
      bundles:        ['AcmeSiteBundle']
      #java: /usr/bin/java
      filters:
          cssrewrite: ~
          #closure:
          #    jar: %kernel.root_dir%/Resources/java/compiler.jar
          #yui_css:
          #    jar: %kernel.root_dir%/Resources/java/yuicompressor-2.4.7.jar
  </code></pre>
  
  <p>Not sure how to proceed.</p>