Custom content added to my gamemode not working...

I’ve added it to /content. I’ve added in to the init. The lua files are (I think) where they should be. It DOES appear in the NPC menu like it is supposed to but when I try to spawn it it says, “Sorry! You can’t spawn that npc!”

Yet, if I add the custom content folder to /addons. It works. (I’m sure GMOD loads up those by default. Why is my gamemode not loading the ones I’m asking it to)

Where is this common error taking place? Any work arounds I should try?

EDIT: For people who find this in the future, learn from my mistakes. Learn the difference between AddCSLuaFile and “include” commands.