Forcing players to download custom models issue.

I’m trying to make player be forced to download this one hat model and it keep coming up as an error.
Here is my code:

This is in my root/lua/autorun/server/forcedownloader.lua


resource.AddFile ("materials/models/tophat/tophat.vmt")
resource.AddFile ("addons/mrgrundley/materials/vgui/entities/mr_grundley.vmt")
resource.AddFile ("addons/mrgrundley/materials/models/tophat/tophat.vmt")
resource.AddFile ("models/tophat/tophat.mdl")
resource.AddFile ("addons/mrgrundley/models/tophat/tophat.mdl")

AddCSLuaFile("forcedownloader.lua")

Thanks