title: How to install symfony cmf with an existing Symfony 2 project?
body: <p>I would like to install Symfony CMF into an existing Symfony2 project.</p>
  
  <p>I am using <a href="http://symfony-cmf.readthedocs.org/en/latest/tutorials/installing-configuring-cmf.html#download-the-bundles" rel="nofollow">this documentation</a>.</p>
  
  <p>After running <code>php composer.phar update</code>, I get the following error:</p>
  
  <pre><code>[RuntimeException]
  
    Could not read http://packagist.org/packages-dev-n.json, either you or the remote host is probably offline.
  
    The "http://packagist.org/packages-dev-n.json" file could not be downloaded
  
  update [--prefer-source] [--dry-run] [--dev] [--no-scripts] [packages1] ... [packagesN]
  
  X-Powered-By: PHP/5.3.13
  Content-type: text/html
  </code></pre>
  
  <p>What am I doing wrong?</p>