Source Sdk Hammer Editor Error Thread

So I am working on a map..and its fairly big.... 7020x7040 (theres a shitload of stuff in it....) and I went to compile and it gave me the error..
"The Command Failed" Windows reported this error:
"The system cannot find the file specified"

any idea on how I can fix this? Been working on this map for about 17 hrs, I'd rather not start over.

heres everything in the compiling window before it stopped...

** Executing...
** Command: "c:\program files (x86)\steam\steamapps\golden_awp3000\sourcesdk\bin\source2009\bin\vbsp.exe"
** Parameters: -game "c:\program files (x86)\steam\steamapps\golden_awp3000\half-life 2\hl2" "C:\Program Files (x86)\Steam\steamapps\golden_awp3000\sourcesdk_content\hl2\mapsrc\mehh.vmf"

Valve Software - vbsp.exe (Sep 15 2011)
8 threads
materialPath: c:\program files (x86)\steam\steamapps\golden_awp3000\half-life 2\hl2\materials
Loading C:\Program Files (x86)\Steam\steamapps\golden_awp3000\sourcesdk_content\hl2\mapsrc\mehh.vmf
Could not locate 'GameData' key in c:\program files (x86)\steam\steamapps\golden_awp3000\half-life 2\hl2\gameinfo.txt
fixing up env_cubemap materials on brush sides...
ProcessBlock_Thread: 0...1...2...3...4...5...6...7...8...9...10 (0)
ProcessBlock_Thread: 0...1...2...3...4...5...6...7...8...9...10 (0)
Processing areas...done (0)
Building Faces...done (0)
Chop Details...done (0)
Find Visible Detail Sides...Bad detail brush side

** Executing...
** Command: "c:\program files (x86)\steam\steamapps\golden_awp3000\sourcesdk\bin\source2009\bin\vvis.exe"
** Parameters: -game "c:\program files (x86)\steam\steamapps\golden_awp3000\half-life 2\hl2" -fast "C:\Program Files (x86)\Steam\steamapps\golden_awp3000\sourcesdk_content\hl2\mapsrc\mehh"

Valve Software - vvis.exe (Sep 15 2011)
fastvis = true
8 threads
reading c:\program files (x86)\steam\steamapps\golden_awp3000\sourcesdk_content\hl2\mapsrc\mehh.bsp
Error opening c:\program files (x86)\steam\steamapps\golden_awp3000\sourcesdk_content\hl2\mapsrc\mehh.bsp

** Executing...
** Command: "c:\program files (x86)\steam\steamapps\golden_awp3000\sourcesdk\bin\source2009\bin\vrad.exe"
** Parameters: -game "c:\program files (x86)\steam\steamapps\golden_awp3000\half-life 2\hl2" "C:\Program Files (x86)\Steam\steamapps\golden_awp3000\sourcesdk_content\hl2\mapsrc\mehh"

Valve Software - vrad.exe SSE (Sep 15 2011)

Valve Radiosity Simulator
8 threads
[Reading texlights from 'lights.rad']
[45 texlights parsed from 'lights.rad']

Loading c:\program files (x86)\steam\steamapps\golden_awp3000\sourcesdk_content\hl2\mapsrc\mehh.bsp
Error opening c:\program files (x86)\steam\steamapps\golden_awp3000\sourcesdk_content\hl2\mapsrc\mehh.bsp

** Executing...
** Command: Copy File
** Parameters: "C:\Program Files (x86)\Steam\steamapps\golden_awp3000\sourcesdk_content\hl2\mapsrc\mehh.bsp" "c:\program files (x86)\steam\steamapps\golden_awp3000\half-life 2\hl2\maps\mehh.bsp"

The command failed. Windows reported the error:
"The system cannot find the file specified."

Could not locate 'GameData' key in c:\program files (x86)\steam\steamapps\golden_awp3000\half-life 2\hl2\gameinfo.txt
fix that

Might also be smart to give a shot at the Hammer's Error Checker (Alt+P)