code: func (l *Log) Errorln(args ...interface{}) {
  	opts := getLoggerOpts(l.module, api.ERROR)
  	if !opts.levelEnabled {
  		return
  	}
  	if l.loadCustomLogger() {
  		l.customLogger.Errorln(args...)
  		return
  	}
  	l.logln(opts, api.ERROR, args...)
  }
docs: // Errorln calls go log.Output.
  // Arguments are handled in the manner of fmt.Println.