[BornHuman]

So NGRP's script is built a bit differently than your conventional script. The main .amx is compiled from NGRP.pwn which uses #include to include different files that serve as the script. Essentially, all systems are in their own separate file. So g_AdminChannelId is defined in one of those files, and is not being used so that's why it's saying line 301. Find g_AdminChannelID and comment it out, same with the rest.