iptables

[Slackrat]

Can anyone explain why this
iptables -A INPUT    -i $WAN_IFACE -m iprange --src-range
74.6.0.0-74.6.255.255 -j LOG --log-prefix "SURVEY: "

gives me this
iptables: Unknown error 4294967295

I am using a guide at 
http://iptables-tutorial.frozentux.net/iptables-tutorial.html#IPRANGEMATCH
(table 10-18)

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