private function __loadDefaultConfig()
    {
        $app_cfgfile = __DIR__.'/../../../config/'.self::CARTE_BLANCHE_CONFIG_FILE;
        if (!file_exists($app_cfgfile)) {
            throw new ErrorException( 
                sprintf('Default application configuration file not found in "%s" [%s]!', $this->getPath('config_dir'), $app_cfgfile)
            );
        }
        $this->getContainer()->get('config')->load($app_cfgfile);
    }