[LCP]insmod myself kernel module failed

[daixi]

study linux kernel module programming
but when i use 'insmod hello-1.o', some error messages:

./hello-1.o: kernel-module version mismatch
./hello-1.o was compiled for kernel version 2.4.20
while this kernel is version 2.4.20-8.

I am newbie to linux kernel programming, help me
tks

Regards
Sophia : )