Edimax EW-7318USg can't set IP

[Piotrek]

Hi

My USB EDIMAX EW-7318USg gives me this error:

ifconfig: ioctl (SIOCAIFADDR): Invalid argument

When i'm trying to set IP and netmask

ifconfig rum0 inet 192.168.0.6 netmask 255.255.255.0

FreeBSD 8.0 STABLE AMD64

any ideas how to fix it ??

Regards
Piotr