Couldn't connect to wireless networking

[纵横天下]

Hi, all.

Last week, I moved from Fedora to FreeBSD.
Then, I try to connect to wireless networking (wifi).
I did some things like handbook, but it showed me:
---------
# /etc/rc.d/netif start
Starting wpa_supplicant.
ioctl [SIOCG80211, op98, len 32]: Invalid argument
ELOOP: remaining socket: sock=5, eloop_data=0x800e0b1c0
user_data=0x800e070f0 handler =0x421840
/etc/rc.d/wpa_supplicant: WARNING: failed to start wpa_supplicant
ifconfig: create: bad value
Starting Network: lo0 ath0
lo: .....
ath0: ....
   status: no carrier
---------

I don't know what i did wrong.
This is my rc.conf:
---------
hostname="laptop.mike"

wlans_ath0="wlan0"
ifconfig_ath0="WPA DHCP"
---------

This is my wpa_supplicant.conf:
---------
network {
    ssid="WEB"
    psk="12345678"
}
---------

btw. how to enable snd_driver when FreeBSD starts?

Thank you very much!
Mike