/**
  * Get the error message from the file error code
  *
  * @param integer $error
  *            The error code
  * @param string $default[optional]
  *            The default message if no error message can be found
  *            
  * @return string The error message
  */
 public function getErrorMessage($error, $default = NULL)
 {
     $messages = $this->_http_files->getErrorMessages();
     if (isset($messages[$error])) {
         return $messages[$error];
     } else {
         if (is_null($default)) {
             return "Erreur indéfinie !";
         } else {
             return $default;
         }
     }
 }