Chat prefixes error.

I read the DarkRP Chat prefixes thread on doing the chat prefixes, but I edited the cl_chat.lua inside the gamemodes, and now when I type in game I get this:

Please help as I’m really getting annoyed.

Reinstall the gamemode and download DarkRP Modification. Don’t edit core files.

It’s okay actually now, sorry for the late reply and thanks for your help.
I fixed this by having a developer experienced with chat tags help me out.