A problem about module driver compiling

Hi,

I’m working on ADC driver development. Basically, it’s a module driver that I can use insmod to install. My platform is BeagleBone black and the kernel version is 3.8.13-bone72.

I encountered a strange problem. I added a new function, and in this function I added printk for message printing. But after compiling it, it cannot be installed correctly. I also called modinfo to check its info below:

root@beaglebone:~#insmod ad1299.ko
Error: could not insert module ad1299.ko: Invalid module format

root@beaglebone:~# modinfo ad1299.ko
filename: /root/ad1299.ko
modinfo: …/libkmod/libkmod-elf.c:207: elf_get_mem: Assertion `offset < elf->size’ failed.
Aborted
root@beaglebone:~#

Is there anyone who can tell me why is this happened?

Any suggestions are appreciated.

Thanks.