private static function _getLoggerStderr() {
        if (!isset(self::$loggerStderr)) {        
            $CymapgtStderrLogger = new MonologLogger('cymapgt_stderr');
            $CymapgtStderrLogger->pushHandler(new ErrorLogHandler());
            self::$loggerStderr = $CymapgtStderrLogger;
        }
        return self::$loggerStderr;
    }