Can't activate wlan0 in CentOS5.5

When I try to activate wlan0 in CentOS5.5, I get this:

Error for wireless request "Set Mode" (8B06) :
    SET failed on device wlan0 ; Invalid argument.

Determining IP information for wlan0...Internal network device wlan0 is not ready.
Aborting..

EDIT: I have the correct driver now, but it's still not working.


Solution 1:

Try modprobe ath5k, the drivers for your card should be in that module.
It has been part of the Linux kernel since 2.6.25 and Red Hat probably backported it to 2.6.18.