Debian Gmod DS - No gamemodes work

I installed a garrysmod dedicated server on my Wheezy box and I keep getting the following problem with every game mode

Couldn’t include file ‘(gamemode name)\gamemode\cl_init.lua’ (File not found) (<nowhere>)
Couldn’t Load Init Script: ‘(gamemode name)/gamemode/cl_init.lua’

Before you ask, yes, cl_init.lua is indeed there with world readable permissions.

I’ve tried the following gamemodes:
TTT
Deathrun
DarkRP

I followed the Debian tutorial to the letter at http://danielgibbs.co.uk/lgsm/gmodserver/

[editline]14th January 2015[/editline]

Solved, you have to edit garrysmod/cfg/game.cfg

and amend the following line

gamemode “gamemodename” (no quotations)