Vi editor help

NEVER MIND

I need to go through a long file and change

masters { 10.9.69.2; 192.168.1.1; }; to masters { 192.168.1.1; };

I know that I can do it in VI with

:s/10.9.69.2;//

but when I try it gives me the error Substitue pattern match failed

I just want to have the one address 192.168.1.1;

What is the correct syntax please?

thanks

:%s/10.9.69.2;//