I'm having the same issue; I don't have Counter-Strike...do you have Counter-Strike? I don't know if that would be a contributing problem...
Is anyone else having this problem?

Try to disable all plugins installed

Originally posted by Kow@lski:

Try to disable all plugins installed

EDIT: I've also completely reinstalled Garry's Mod, and E still fails.
I've also noticed that Lua Jit appears to be disabled...what the heck?

I disabled everything I was subscribed to, except for "PropHunt (Hide'n'Seek)".
Trouble in Terrorist Town still shows up as a gamemode--I don't know why or how to remove it, since it doesn't even show up as something I'm subscribed to.

Anyway, it still didn't work; pressing E does nothing.

Here are the Lua errors that were generated when I started a new game in TF2 Sawmill:

[PropHunt (Hide'n'Seek)] gamemodes/fretta/gamemode/cl_hud.lua:102: bad argument #1 to 'SetText' (string expected, got table)
1. SetText - [C]:-1
2. UpdateHUD_RoundResult - gamemodes/fretta/gamemode/cl_hud.lua:102
3. RefreshHUD - gamemodes/fretta/gamemode/cl_hud.lua:69
4. HUDPaint - gamemodes/fretta/gamemode/cl_hud.lua:85
5. unknown - gamemodes/fretta/gamemode/cl_hud.lua:82

[Skopher|3|STEAM_0:0:47365530] Lua Error:
Couldn't include file 'cl_hints.lua' (File not found) (@gamemodes/prop_hunt/gamemode/cl_init.lua (line 3))

[Skopher|3|STEAM_0:0:47365530] Lua Error:

[ERROR] lua/includes/extensions/entity.lua:132: attempt to index local 'ent' (a number value)
1. v - lua/includes/extensions/entity.lua:132
2. unknown - lua/includes/modules/hook.lua:82


[Skopher|3|STEAM_0:0:47365530] Lua Error:

[PropHunt (Hide'n'Seek)] gamemodes/fretta/gamemode/cl_hud.lua:102: bad argument #1 to 'SetText' (string expected, got table)
1. SetText - [C]:-1
2. UpdateHUD_RoundResult - gamemodes/fretta/gamemode/cl_hud.lua:102
3. RefreshHUD - gamemodes/fretta/gamemode/cl_hud.lua:69
4. HUDPaint - gamemodes/fretta/gamemode/cl_hud.lua:85
5. unknown - gamemodes/fretta/gamemode/cl_hud.lua:82

I've been pounding at this for a while...
And you know what?

When it installs, nothing gets installed in the gamemodes folder!

Couldn't include file 'cl_hints.lua' (File not found) (@gamemodes/prop_hunt/gamemode/cl_init.lua (line 3))

When I looked at the folder, there was no "prop_hunt" folder, at all...

I've been to your GitHub page, but I can't find a .zip button or download anywhere...how can I get these files?

https://github.com/xspacesoft/PropHunt/tree/master/gamemodes/prop_hunt

https://github.com/xspacesoft/PropHunt/archive/master.zip

Hello there. (Sorry for my bad english). Elbcore3, i downloaded the .zip file you've shown with the site, and i put it in the gamemode folder. I think i should do this. :D If i've done something wrong, please let me know. I entered the game, and even clicking E, i can't turn into a prop on cs_office map. It gives me this error:

Attempted to create unknown entity type hostage_entity!
Can't init hostage_entity

I don't know what to do... can you help me? Or anyone else? Thanks!

found download link for the zip http://xspacesoft.github.io/PropHunt/

Exortonian, sorry but i dont know where to extract the zip. Can someone tell me where to put it?

Thank you everyone for answering this question, (allot) :P