Failed to initialize EAPOL state machines

[Nicolas]

Hello,

I try to set up WPA between my Linksys WRT54G wireless router and my
laptop.  Here are my settings:

Laptop: Debian SID, kernel 2.4.24, hostap module, senao wireless card
wpa_supplicant: version 0.2.1

On the Linksys router:
Security mode: WPA pre-share key
WPA algorithms: AES
WPA Shared key: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Group key renewal: 3600 seconds

Here's my wpa_supplicant.conf file:
network={
        ssid="my_ssid"
	proto=WPA
	key_mgmt=WPA-PSK
	pairwise=CCMP
	group=CCMP
        psk=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
}

I run wpa_supplicant this way:
wpa_spplicant -iwlan0 -d -c/etc/wpa_supplicant.conf

Here's the output:
Failed to initialize EAPOL state machines.

What could be wrong? The connection works fine without WPA.

Thanks for the help.