error : no symbol version for "function"

Hi all, I am trying to port a kernel module from 2.6.23 kernel to 2.6.32 kernel. While inserting the module , it shows an error : insmod : error inserting 'module.ko' : -1 Unknown symbol in module I checked in /var/log/messages for the unknown symbol and it shows, module : no symbol version for function_name Can anybody explain what is this error and how to resolve this error ? -- Thanks & Regards, Kashish Bhatia