Try to be more specific please. how did you install the addon?

i installed it using the GMAD extractor, i put the addon folder in the gamemodes folder of my server, that's it though, the only things i see in the folder of the gamemode are, backgrounds, gamemode, guesswho.txt, icon24.png, and logo.png. if that helps. Am i supposed to have anything else in the folder like entities or something?

Just extract it into the addons folder, do not move it into gamemodes. Also make sure to move the map .nav files from the addon to your gmod maps directory. See https://github.com/lolleko/guesswho/wiki/installation for detailed instructions.

thank you, it works now!

I have the same issue aswell, but when i spawn i just immediatly die and it really is annoying. My npcs dont spawn and i tried my best to do what it says on the wiki, please help.