Gmod Hammer stopped working out of nowhere!

[rik4100]

[IMG]http://i.imgur.com/amz1KxM.png[/IMG]

[B]Now before anyone asks: NO... I haven't changed anything in the paths![/B]

[B]The last config I used goes as following:[/B]
Game Configuration:
Config: Garry's Mod
Game data files: $SteamUserDir\GarrysMod\garrysmod.fgd
Texture Format: Materials (Half-Life 2)
Map Type: Half-Life 2
Default PointEntity Class: info_player_start
Default SolidEntity Class: func_detail
Default Texture Scale: 0.25
Default Lightmap Scale: 16
Cordon Texture: tools/toolsskybox
Game exe dir: $SteamUserDir\GarrysMod
Game Dir: $SteamUserDir\GarrysMod\garrysmod
VMF dir: $SteamUserDir\GarrysMod\garrysmod\mapsrc

Build Programs:
Game exe: $SteamUserDir\GarrysMod\hl2.exe
BSP exe: $SteamUserDir\Source SDK Base 2013 Multiplayer\bin\vbsp.exe
VIS exe: $SteamUserDir\Source SDK Base 2013 Multiplayer\bin\vvis.exe
RAD exe: $SteamUserDir\Source SDK Base 2013 Multiplayer\bin\vrad.exe
compiled map dir: $SteamUserDir\GarrysMod\garrysmod\maps

I've been working with this last config for months and it always worked fine.

AND SUDDENLY OUT OF NOWHERE it stopped working, having this classic error.

I have no clue how to fix this... I've tried alternate paths, reconfigure paths...
I talked about it with TopHATTwaffle, nor did he seem to know what the problem is.

Now I'm forced to use any other game's hammer of which none are able to use the Gmod Config.

[B]PLEASE HELP ME OUT.[/B]

[Procrastinate]

Don't use Source SDK, as it's broken.
Go to your CSS bin directory (C:\Program Files (x86)\Steam\steamapps\common\Counter-Strike Source\bin) and run hammer.exe

If you want to use a variation of games use [URL="http://facepunch.com/showthread.php?t=1327883"]Source Multi-Tool[/URL].