Here's the compile log:
** Executing...
** Command: "C:\Program Files (x86)\Steam\steamapps\common\Team Fortress 2\bin\vbsp.exe"
** Parameters: -game "C:\Program Files (x86)\Steam\steamapps\common\Team Fortress 2\tf" "C:\Program Files (x86)\Steam\steamapps\common\Team Fortress 2\sourcesdk_content\tf\mapsrc\KOTH_Snow\koth_snow.vmf"
Valve Software - vbsp.exe (Jun 14 2017)
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\KOTH_Snow\koth_snow.vmf
ConVarRef mat_reduceparticles doesn't point to an existing ConVar
Patching WVT material: maps/koth_snow/cp_sunshine/nature/blendrocktograss001_wvt_patch
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...
Merged 62 detail faces...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\KOTH_Snow\koth_snow.prt...Building visibility clusters...
done (0)
Creating default LDR cubemaps for env_cubemap using skybox materials:
skybox/sky_hydro_01*.vmt
! Run buildcubemaps in the engine to get the correct cube maps.
Creating default HDR cubemaps for env_cubemap using skybox materials:
skybox/sky_hydro_01*.vmt
! Run buildcubemaps in the engine to get the correct cube maps.
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) (55724 bytes)
Placing detail props : 0...1...2...3...4...5...6...7...8...9...10
Compacting texture/material tables...
Reduced 227 texinfos to 123
Reduced 19 texdatas to 16 (465 bytes to 384)
Writing C:\Program Files (x86)\Steam\steamapps\common\Team Fortress 2\sourcesdk_content\tf\mapsrc\KOTH_Snow\koth_snow.bsp
Wrote ZIP buffer, estimated size 106435, actual size 106087
0 seconds elapsed
** Executing...
** Command: "C:\Program Files (x86)\Steam\steamapps\common\Team Fortress 2\bin\vvis.exe"
** Parameters: -game "C:\Program Files (x86)\Steam\steamapps\common\Team Fortress 2\tf" "C:\Program Files (x86)\Steam\steamapps\common\Team Fortress 2\sourcesdk_content\tf\mapsrc\KOTH_Snow\koth_snow"
Valve Software - vvis.exe (Jun 14 2017)
4 threads
reading c:\program files (x86)\steam\steamapps\common\team fortress 2\sourcesdk_content\tf\mapsrc\koth_snow\koth_snow.bsp
reading c:\program files (x86)\steam\steamapps\common\team fortress 2\sourcesdk_content\tf\mapsrc\koth_snow\koth_snow.prt
75 portalclusters
191 numportals
BasePortalVis: 0...1...2...3...4...5...6...7...8...9...10 (0)
PortalFlow: 0...1...2...3...4...5...6...7...8...9...10 (0)
Optimized: 6 visible clusters (0.13%)
Total clusters visible: 4705
Average clusters visible: 62
Building PAS...
Average clusters audible: 74
visdatasize:2105 compressed from 2400
writing c:\program files (x86)\steam\steamapps\common\team fortress 2\sourcesdk_content\tf\mapsrc\koth_snow\koth_snow.bsp
0 seconds elapsed
** Executing...
** Command: "C:\Program Files (x86)\Steam\steamapps\common\Team Fortress 2\bin\vrad.exe"
** Parameters: -game "C:\Program Files (x86)\Steam\steamapps\common\Team Fortress 2\tf" "C:\Program Files (x86)\Steam\steamapps\common\Team Fortress 2\sourcesdk_content\tf\mapsrc\KOTH_Snow\koth_snow"
Valve Software - vrad.exe SSE (Jun 14 2017)
Valve Radiosity Simulator
4 threads
[Reading texlights from 'lights.rad']
unknown light specifier type - lights
[56 texlights parsed from 'lights.rad']
Loading c:\program files (x86)\steam\steamapps\common\team fortress 2\sourcesdk_content\tf\mapsrc\koth_snow\koth_snow.bsp
Setting up ray-trace acceleration structure... Done (0.07 seconds)
603 faces
184687 square feet [26595056.00 square inches]
0 Displacements
0 Square Feet [0.00 Square Inches]
603 patches before subdivision
10847 patches after subdivision
sun extent from map=0.008727
5 direct lights
BuildFacelights: 0...1...2...3...4...5...6...7...8...9...10 (2)
BuildVisLeafs: 0...1...2...3...4...5...6...7...8...9...10 (1)
transfers 775465, max 306
transfer lists: 5.9 megs
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Build Patch/Sample Hash Table(s).....Done<0.0066 sec>
FinalLightFace: 0...1...2...3...4...5...6...7...8...9...10 (1)
FinalLightFace Done
0 of 0 (0% of) surface lights went in leaf ambient cubes.
ThreadComputeLeafAmbient: 0...1...2...3...4...5...6...7...8...9...10 (1)
Writing leaf ambient...done
Ready to Finish
Object names Objects/Maxobjs Memory / Maxmem Fullness
------------ --------------- --------------- --------
models 18/1024 864/49152 ( 1.8%)
brushes 151/8192 1812/98304 ( 1.8%)
brushsides 966/65536 7728/524288 ( 1.5%)
planes 482/65536 9640/1310720 ( 0.7%)
vertexes 996/65536 11952/786432 ( 1.5%)
nodes 288/65536 9216/2097152 ( 0.4%)
texinfos 123/12288 8856/884736 ( 1.0%)
texdata 16/2048 512/65536 ( 0.8%)
dispinfos 0/0 0/0 ( 0.0%)
disp_verts 0/0 0/0 ( 0.0%)
disp_tris 0/0 0/0 ( 0.0%)
disp_lmsamples 0/0 0/0 ( 0.0%)
faces 603/65536 33768/3670016 ( 0.9%)
hdr faces 0/65536 0/3670016 ( 0.0%)
origfaces 400/65536 22400/3670016 ( 0.6%)
leaves 307/65536 9824/2097152 ( 0.5%)
leaffaces 753/65536 1506/131072 ( 1.1%)
leafbrushes 301/65536 602/131072 ( 0.5%)
areas 2/256 16/2048 ( 0.8%)
surfedges 4804/512000 19216/2048000 ( 0.9%)
edges 2884/256000 11536/1024000 ( 1.1%)
LDR worldlights 5/8192 440/720896 ( 0.1%)
HDR worldlights 0/8192 0/720896 ( 0.0%)
leafwaterdata 0/32768 0/393216 ( 0.0%)
waterstrips 132/32768 1320/327680 ( 0.4%)
waterverts 0/65536 0/786432 ( 0.0%)
waterindices 2418/65536 4836/131072 ( 3.7%)
cubemapsamples 0/1024 0/16384 ( 0.0%)
overlays 0/512 0/180224 ( 0.0%)
LDR lightdata [variable] 512500/0 ( 0.0%)
HDR lightdata [variable] 0/0 ( 0.0%)
visdata [variable] 2105/16777216 ( 0.0%)
entdata [variable] 18067/393216 ( 4.6%)
LDR ambient table 307/65536 1228/262144 ( 0.5%)
HDR ambient table 307/65536 1228/262144 ( 0.5%)
LDR leaf ambient 1356/65536 37968/1835008 ( 2.1%)
HDR leaf ambient 307/65536 8596/1835008 ( 0.5%)
occluders 0/0 0/0 ( 0.0%)
occluder polygons 0/0 0/0 ( 0.0%)
occluder vert ind 0/0 0/0 ( 0.0%)
detail props [variable] 1/12 ( 8.3%)
static props [variable] 1/3046 ( 0.0%)
pakfile [variable] 106087/0 ( 0.0%)
physics [variable] 55724/4194304 ( 1.3%)
physics terrain [variable] 2/1048576 ( 0.0%)
Level flags = 0
Total triangle count: 2004
Writing c:\program files (x86)\steam\steamapps\common\team fortress 2\sourcesdk_content\tf\mapsrc\koth_snow\koth_snow.bsp
6 seconds elapsed
** Executing...
** Command: Copy File
** Parameters: "C:\Program Files (x86)\Steam\steamapps\common\Team Fortress 2\sourcesdk_content\tf\mapsrc\KOTH_Snow\koth_snow.bsp" "C:\Program Files (x86)\Steam\steamapps\common\Team Fortress 2\tf\maps\koth_snow.bsp"