Starting a 'Full - Both' compile.
Starting compilation of mvm_urban_t1
Valve Software - vbsp.exe (Aug  2 2018)
4 threads
materialPath: C:\Program Files (x86)\Steam\SteamApps\common\Team Fortress 2\tf\materials
Loading C:\Program Files (x86)\Steam\steamapps\common\Team Fortress 2\sourcesdk_content\tf\mapsrc\mvm_urban_t1.vmf
ConVarRef mat_reduceparticles doesn't point to an existing ConVar
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...done (0)
Merging details...done (0)
FixTjuncs...
PruneNodes...
WriteBSP...
done (0)
writing C:\Program Files (x86)\Steam\steamapps\common\Team Fortress 2\sourcesdk_content\tf\mapsrc\mvm_urban_t1.prt...Building visibility clusters...
done (0)
*** Error: Skybox vtf files for skybox/sky_well_01 weren't compiled with the same size texture and/or same flags!
Can't load skybox file skybox/sky_well_01 to build the default cubemap!
*** Error: Skybox vtf files for skybox/sky_well_01 weren't compiled with the same size texture and/or same flags!
Can't load skybox file skybox/sky_well_01 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) (37614 bytes)
Placing detail props : 0...1...2...3...4...5...6...7...8...9...10
Compacting texture/material tables...
Reduced 222 texinfos to 100
Reduced 17 texdatas to 14 (416 bytes to 340)
Writing C:\Program Files (x86)\Steam\steamapps\common\Team Fortress 2\sourcesdk_content\tf\mapsrc\mvm_urban_t1.bsp
Wrote ZIP buffer, estimated size 443, actual size 363
1 second elapsed
Valve Software - vvis.exe (Mar  6 2018)
Valve Software - vrad.exe SSE (Mar  6 2018)

      Valve Radiosity Simulator
C:\Program Files (x86)\Steam\steamapps\common\Team Fortress 2\sourcesdk_content\tf\mapsrc\mvm_urban_t1.bsp -> C:\Program Files (x86)\Steam\SteamApps\common\Team Fortress 2\tf\maps\mvm_urban_t1.bsp
1 File(s) copied
'Full - Both' compile finished in 00:00:09
2 errors/warnings logged:
  2 errors/warnings logged for mvm_urban_t1:
    ● 2x: Caution: Can't load skybox file [sub:1] to build the default cubemap!