urtwn: ioctl[SIOCS80211, op=16, arg_len=0]: Invalid argument

I'm trying to setup Asus USB-N10 nano wireless
adapter. I get:

urtwn0: <vendor 0x0b05 product 0x17ba,
 class 0/0, rev 2.00/2.00, addr 1> on usbus0
urtwn0: MAC/BB RTL8188CUS, RF 6052 1T1R

urtwn0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 2290
        ether 1c:87:2c:c7:c2:6e
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: IEEE 802.11 Wireless Ethernet autoselect (autoselect)
        status: no carrier

# wpa_supplicant -i urtwn0 -c /etc/wpa_supplicant.conf
Successfully initialized wpa_supplicant
ioctl[SIOCS80211, op=16, arg_len=0]: Invalid argument
urtwn0: Failed to initialize driver interface
ELOOP: remaining socket: sock=4 eloop_data=0x801c11600
 user_data=0x801c2c100 handler=0x422dd0     

# cat /boot/loader.conf
kern.vty=vt
linux_load="YES"
#cuse4bsd_load="YES"
if_urtwn_load="YES"
legal.realtek.license_ack=1

# uname -a
FreeBSD rat 11.0-CURRENT FreeBSD 11.0-CURRENT #1 r286741:
 Thu Aug 13 22:13:28 BST 2015
  root_at_rat:/usr/obj/usr/src/sys/GENERIC  amd64

Please advise

Thanks

Anton