Halp.
** Executing…
** Command: “c:\program files (x86)\steam\steamapps\kd287\sourcesdk\bin\ep1\bin\vbsp.exe”
** Parameters: -game “c:\program files (x86)\steam\steamapps\kd287\counter-strike source\cstrike” “C:\Program Files (x86)\Steam\steamapps\kd287\sourcesdk_content\cstrike\mapsrc\realtest”
Valve Software - vbsp.exe (Dec 11 2006)
2 threads
materialPath: c:\program files (x86)\steam\steamapps\kd287\counter-strike source\cstrike\materials
Loading C:\Program Files (x86)\Steam\steamapps\kd287\sourcesdk_content\cstrike\mapsrc\realtest.vmf
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)
FixTjuncs…
PruneNodes…
WriteBSP…
done (0)
writing C:\Program Files (x86)\Steam\steamapps\kd287\sourcesdk_content\cstrike\mapsrc\realtest.prt…done (0)
Creating default cubemaps for env_cubemap using skybox materials:
skybox/italy*.vmt
Run buildcubemaps in the engine to get the correct cube maps.
No such variable “$hdrbasetexture” for material “skybox/italyrt”
Can’t load skybox file skybox/italy to build the default cubemap!
Finding displacement neighbors…
Finding lightmap sample positions…
Displacement Alpha : 0…1…2…3…4…5…6…7…8…9…10
Building Physics collision data…
done (0) (14926 bytes)
Placing detail props : 0…1…2…3…4…5…6…7…8…9…10
Error! Entity sky_camera in solid volume!
** Executing…
** Command: “c:\program files (x86)\steam\steamapps\kd287\sourcesdk\bin\ep1\bin\vrad.exe”
** Parameters: -game “c:\program files (x86)\steam\steamapps\kd287\counter-strike source\cstrike” “C:\Program Files (x86)\Steam\steamapps\kd287\sourcesdk_content\cstrike\mapsrc\realtest”
Valve Software - vrad.exe SSE (Nov 8 2007)
----- Radiosity Simulator ----
2 threads
[Reading texlights from ‘lights.rad’]
[1 texlights parsed from ‘lights.rad’]
Loading c:\program files (x86)\steam\steamapps\kd287\sourcesdk_content\cstrike\mapsrc\realtest.bsp
Error opening c:\program files (x86)\steam\steamapps\kd287\sourcesdk_content\cstrike\mapsrc\realtest.bsp
** Executing…
** Command: Copy File
** Parameters: “C:\Program Files (x86)\Steam\steamapps\kd287\sourcesdk_content\cstrike\mapsrc\realtest.bsp” “c:\program files (x86)\steam\steamapps\kd287\counter-strike source\cstrike\maps\realtest.bsp”
The command failed. Windows reported the error:
“The system cannot find the file specified.”
Thanks ya kindly 
I’ve been doing the skybox the same way for my past 5 test maps, I don’t think it could be the skybox error. Thanks