CactiEZ 無法產生流量圖

CactiEZ 突然無法正常產生流量圖，經查詢 Console -> Utilities -> View Cacti Log File，發現下列訊息。

07/05/2016 03:20:02 PM - POLLER: Poller[0] NOTE: Cron is configured to run too often! The Poller Interval is '60' seconds, with a minimum Cron period of '60' seconds, but only -65947139 seconds have passed since the poller last ran.
07/05/2016 03:20:02 PM - POLLER: Poller[0] NOTE: Poller Int: '60', Cron Int: '60', Time Since Last: '-65947139', Max Runtime '58', Poller Runs: '1'

 解決方法有兩種。
一、在 Crontab 中加入 --force 參數。

二、修改 /var/www/html/poller.php 內的參數。
　　　$force = FALSE
　　　　　to
　　　$force = TURE