kernel-module version mismatch

I have running debian 3.0 kernel 2.4.21 and followed this howto,
http://atmelwlandriver.sourceforge.net/howto/ compiled fine but thats 
what happened when i try to load usbvnetr.o:

linux:~/atmelwlandriver2# modprobe usbvnetr
/lib/modules/2.4.21-4-686/kernel/drivers/usb/usbvnetr.o: kernel-module 
version mismatch
         /lib/modules/2.4.21-4-686/kernel/drivers/usb/usbvnetr.o was 
compiled for kernel version 2.4.19
         while this kernel is version 2.4.21-4-686.
/lib/modules/2.4.21-4-686/kernel/drivers/usb/usbvnetr.o: insmod 
/lib/modules/2.4.21-4-686/kernel/drivers/usb/usbvnetr.o failed
/lib/modules/2.4.21-4-686/kernel/drivers/usb/usbvnetr.o: insmod usbvnetr 
failed

all kernel sources are installed and at its place. I dont know what to 
do now to fix this damn mismatch. It would be great if someone can help 
me with my problem!