title: Symfony - An exception has been thrown during the rendering of a template
body: <p>I have been using Codeigniter for sometime now and thought I would try out Symfony. I am very new to Symfony and working from the demo project. When I launch the demo project in my browser I get this error:</p>
  
  <pre><code>An exception has been thrown during the rendering of a template ("An exception occured in driver: could not find driver") in blog/index.html.twig at line 6.
  500 Internal Server Error - Twig_Error_Runtime
  3 linked Exceptions: DriverException » PDOException » PDOException »
  </code></pre>
  
  <p>I am not sure where to begin. Can someone please help me in the right direction?</p>