def error(topic, message = nil)
      $stderr.puts(message(topic, message).red) if log_level <= ERROR
    end
def error(topic, message = nil)
      $stderr.puts(message(topic, message).red) if log_level <= ERROR
    end
Public: Print a error message to stderr

 topic - the topic of the message, e.g. "Configuration file", "Deprecation", etc.
 message - the message detail

 Returns nothing