graphs with external script

list 刘正明
Mon, 29 Aug 2005 11:52:54 +0800
Message-Id: <user-1a8214be7571@xymon.invalid>

the /var/log/larrd-status.log :
2005-08-29 11:46:25 RRD error updating /home/monitor/data/rrd/proxy.neusoft.com/concurrent.rrd from 192.168.20.87:
illegal attempt to update using time 1125287185 when last update time is
1125287185 (minimum one second step)
what is it?
thank you