Unable to compile maps

I have just started looking into making my own maps for Garry’s Mod, started with very basic map and I have found out that I can’t compile the map properly.

Here is the compile log:

** Executing…
** Command: “f:\steam\steamapps\hamster1998157\sourcesdk\bin\orangebox\bin\vbsp.exe”
** Parameters: -game “f:\steam\steamapps\hamster1998157\garrysmod\garrysmod” “F:\Steam\steamapps\hamster1998157\garrysmod\garrysmod\maps\flatgrass_huge.vmf”

Valve Software - vbsp.exe (May 7 2010)
2 threads
materialPath: f:\steam\steamapps\hamster1998157\garrysmod\garrysmod\materials
Loading F:\Steam\steamapps\hamster1998157\garrysmod\garrysmod\maps\flatgrass_huge.vmf
ConVarRef mat_reduceparticles doesn’t point to an existing ConVar
Could not locate ‘GameData’ key in f:\steam\steamapps\hamster1998157\garrysmod\garrysmod\gameinfo.txt
fixing up env_cubemap materials on brush sides…
ProcessBlock_Thread: 0…1…2…3…4…5…6…7…8…9…10 (0)
**** leaked ****
Entity info_player_start (0.82 0.00 -16097.90) leaked!
Processing areas…done (0)
Building Faces…done (0)
FixTjuncs…
HashVec: point outside valid range

** Executing…
** Command: “f:\steam\steamapps\hamster1998157\sourcesdk\bin\orangebox\bin\vvis.exe”
** Parameters: -game “f:\steam\steamapps\hamster1998157\garrysmod\garrysmod” “F:\Steam\steamapps\hamster1998157\garrysmod\garrysmod\maps\flatgrass_huge”

Valve Software - vvis.exe (May 7 2010)
2 threads
reading f:\steam\steamapps\hamster1998157\garrysmod\garrysmod\maps\flatgrass_huge.bsp
Error opening f:\steam\steamapps\hamster1998157\garrysmod\garrysmod\maps\flatgrass_huge.bsp

** Executing…
** Command: “f:\steam\steamapps\hamster1998157\sourcesdk\bin\orangebox\bin\vrad.exe”
** Parameters: -game “f:\steam\steamapps\hamster1998157\garrysmod\garrysmod” “F:\Steam\steamapps\hamster1998157\garrysmod\garrysmod\maps\flatgrass_huge”

Valve Software - vrad.exe SSE (May 7 2010)

  Valve Radiosity Simulator     

2 threads
Could not find lights.rad in lights.rad.
Trying VRAD BIN directory instead…
Warning: Couldn’t open texlight file f:\steam\steamapps\hamster1998157\sourcesdk\bin\orangebox\bin\lights.rad.
Loading f:\steam\steamapps\hamster1998157\garrysmod\garrysmod\maps\flatgrass_huge.bsp
Error opening f:\steam\steamapps\hamster1998157\garrysmod\garrysmod\maps\flatgrass_huge.bsp

** Executing…
** Command: Copy File
** Parameters: “F:\Steam\steamapps\hamster1998157\garrysmod\garrysmod\maps\flatgrass_huge.bsp” “f:\steam\steamapps\hamster1998157\garrysmod\garrysmod\maps\flatgrass_huge.bsp”

What I find difficult to understand is the bits where it states:

Error opening f:\steam\steamapps\hamster1998157\garrysmod\garrysmod\maps\flatgrass_huge.bsp

Sorry about the spaces between “garrysmod” and “orangebox”, these do not appear in compile log I have on my computer.

Please post if you know something that could help,
Hamster1998

Your map is too big, try making the map 128 units smaller on each side so that it’s less close to the end of the grid.

Thanks AntonFTW, I have successfully built my map.