Gmod really need help please

Yes that would be broken, the messages it's trying to interact with aren't set up/established properly on the server-side. To verify this I did a little research of my own and checked the changelogs on the gmodstore for this addon, 4 months gmod had a "stealth" update that changed the way the net library works, and so it needed to be fixed, the version you're using is above and beyond 4 months ago, you'll need to find a leak a lot more recent than that. Jobs aren't hard to do anyways, I'd rather do it manually than have an addon manage it for me anyways.

https://i.imgur.com/4bkIjHc.png