New strange message in wireless connexion

[Tanguy Eric]

After i installed the new kernel 2.6.24.3-34.fc8 i have this strange 
message :
$ ifup wlan0
Error for wireless request "Set Encode" (8B2A) :
    SET failed on device wlan0 ; No such file or directory.

I never see it before and nothing in ifcfg-wlan0 is related to Set Encode.
$lspci
02:08.0 Network controller: RaLink RT2500 802.11g Cardbus/mini-PCI (rev 01)

Thanks

Eric