title: jekyll 2.0.3 Error: undefined method `pygments_prefix' for #<Jekyll::Converters::Identity>
body: <p>I am trying to <code>jekyll serve</code> a website that was created with a previous version of jekyll. </p>
  
  <p>I had to update my <code>_config.yml</code> file from this:</p>
  
  <pre><code>#Build settings
  markdown: rdiscount
  pygments: true
  paginate: 100
  permalink: pretty
  </code></pre>
  
  <p>To this:</p>
  
  <pre><code>#Build settings
  markdown: rdiscount
  highlighter: pygments
  paginate: 100
  permalink: pretty
  </code></pre>
  
  <p>This should be OK but I get the following error when I try to <code>serve</code> the application.</p>
  
  <pre><code>jekyll 2.0.3 Error:  undefined method `pygments_prefix' for #&lt;Jekyll::Converters::Identity&gt;`
  </code></pre>
  
  <p>Any help on that? Thank you</p>