Invalid module format

Hi guys,

Just switched to 2.6.8 kernel (from 2.4) under Gentoo and everything was 
looking good. I grabbed a copy of the CVS driver, it compiled with no 
errors, installed with no errors but when i insmod at76c503-rfmd i get:

WARNING: Error inserting at76_usbdfu 
(/lib/modules/2.6.8-gentoo-r3/kernel/drivers/net/wireless/at76c503/at76_usbdfu.o): 
Invalid module format
WARNING: Error inserting at76c503 
(/lib/modules/2.6.8-gentoo-r3/kernel/drivers/net/wireless/at76c503/at76c503.o): 
Invalid module format
FATAL: Error inserting at76c503_rfmd 
(/lib/modules/2.6.8-gentoo-r3/kernel/drivers/net/wireless/at76c503/at76c503-rfmd.o): 
Invalid module format

Any ideas on what may be causing this? the kernel compiled fine as have 
other modules :|

Any suggestions would be appreciated. Or of anyone has working binaries 
of the above for the usb device that they could mail over it would be 
appreciated

thanks,

Wiggi