title: Can't use flash method in prod environment
body: <p>I'm using the setFlash and hasFlash methods of symfony 1.4 with WAMP 2.0</p>
  
  <p>Locally with my frontend_dev app, all work fine.
  But in production environment, my test <code>$this-&gt;forward404Unless($user-&gt;hasFlash('resultsArray'));</code> fails.</p>
  
  <p>I thought that the flash methods where enabled by default. What can I do to make it works please ?</p>
  
  <p>Edit : I found an interesting error message.</p>
  
  <p>Here is my filters.yml file</p>
  
  <pre><code># You can find more information about this file on the symfony website:
  # http://www.symfony-project.org/reference/1_4/en/12-Filters
  
  rendering: ~
  security:  ~
  
  # insert your own filters here
  
  cache:     ~
  flash:     ~
  execution: ~
  </code></pre>
  
  <p>In the frontend_prod.log, I have :</p>
  
  <blockquote>
    <p>Mar 16 05:57:42 symfony [info] {sfPatternRouting} Match route "homepage" (/) for / with parameters array (  'module' => 'main',  'action' => 'index',)<br>
    Mar 16 05:57:42 symfony [err] {sfParseException} Configuration file "D:\wamp\bin\php\symfony\symfony14\lib/config/config/filters.yml" specifies category "flash" with missing class key.</p>
  </blockquote>