General :: Association Request To The Driver Failed When Using Wpa_supplicant With Madwifi?

I'm trying to manually connect my wireless adapter to my router using WPA. I'm using Madwifi drivers for my D-Link DWL-G630. I keep getting the same error " Association request to the driver failed". I can connect to my router using wep through the GUI. I can not connect using the terminal. I created my /etc/wpa_supplicant.conf file

ap_scan=1
ctrl_interface=/var/run/wpa_supplicant
network={
ssid="NYNET"
scan_ssid=0

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I run these two commands

sudo ifconfig wlan3 down
sudo dhclient -r wlan3

the I run

sudo wpa_supplicant -Dwext -iwlan3 -c/etc/wpa_supplicant.conf -dd

jmorales@jmorales-laptop:~$ sudo ifconfig wlan3 up
jmorales@jmorales-laptop:~$ sudo dhclient -r wlan3
Internet Systems Consortium DHCP Client V3.1.2

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