error : insmod

hi all, while inserting module to the linux kernel, m facing this problem -------------------------------------------ERROR----------------------------------------------------- sunil@ubuntu:~/test/drive$ insmod helloworld.ko insmod: error inserting 'helloworld.ko': -1 Operation not permitted sunil@ubuntu:~/test/drive$ sudo modprobe helloworld FATAL: Module helloworld not found. please help!! thanks & regards Sunil