"error -1: key not found" when installing hello.c module on Ubuntu12.04 (no replies)

Hi,
i got "insmod error -1: key not available" when inserting hello.c module into kernel on ubuntu12.04 (64 bit) (on VMWare).
I updated ubuntu with apt-get commands. Installed some other libraires like ncurses. installed latest 3.7.9 kernel.
compiled successfully simple hello.c module (which jst prints hello world) with make command.



I tried "sudo insmod hello.ko" also tried it without sudo. then i got above quoted remark.

Plz help me...