/**
  * @param sfProjectConfiguration $configuration
  * 
  * @return fpErrorNotifier
  */
 public static function initialize(sfProjectConfiguration $configuration)
 {
     if (empty(self::$instance)) {
         $configFiles = $configuration->getConfigPaths('config/notify.yml');
         $config = sfDefineEnvironmentConfigHandler::getConfiguration($configFiles);
         foreach ($config as $name => $value) {
             sfConfig::set("sf_notify_{$name}", $value);
         }
         self::$instance = new self($configuration->getEventDispatcher());
         self::getInstance()->handler()->initialize();
     }
     return self::$instance;
 }