You probably went over an error in the compile log's entirety then, post it here or try checking it via
http://www.interlopers.net/errors/
Here is my compile:
** 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_drainage_a1.vmf"
Valve Software - vbsp.exe (Oct 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_drainage_a1.vmf
Patching WVT material: maps/koth_drainage_a1/nature/blendgroundtograss008_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...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_drainage_a1.prt...Building visibility clusters...
done (0)
*** Error: Skybox vtf files for skybox/sky_alpinestorm_01 weren't compiled with the same size texture and/or same flags!
Can't load skybox file skybox/sky_alpinestorm_01 to build the default cubemap!
*** Error: Skybox vtf files for skybox/sky_alpinestorm_01 weren't compiled with the same size texture and/or same flags!
Can't load skybox file skybox/sky_alpinestorm_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) (36513 bytes)
Placing detail props : 0...1...2...3...4...5...6...7...8...9...10
Compacting texture/material tables...
Reduced 104 texinfos to 71
Reduced 10 texdatas to 9 (290 bytes to 261)
Writing C:\Program Files (x86)\Steam\steamapps\common\Team Fortress 2\sourcesdk_content\tf\mapsrc\koth_drainage_a1.bsp
Wrote ZIP buffer, estimated size 644, actual size 564
1 second 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_drainage_a1"
Valve Software - vvis.exe (Oct 14 2017)
4 threads
reading c:\program files (x86)\steam\steamapps\common\team fortress 2\sourcesdk_content\tf\mapsrc\koth_drainage_a1.bsp
reading c:\program files (x86)\steam\steamapps\common\team fortress 2\sourcesdk_content\tf\mapsrc\koth_drainage_a1.prt
185 portalclusters
615 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 (2)
Optimized: 28 visible clusters (0.12%)
Total clusters visible: 23998
Average clusters visible: 129
Building PAS...
Average clusters audible: 185
visdatasize:10472 compressed from 8880
writing c:\program files (x86)\steam\steamapps\common\team fortress 2\sourcesdk_content\tf\mapsrc\koth_drainage_a1.bsp
2 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_drainage_a1"
Valve Software - vrad.exe SSE (Oct 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_drainage_a1.bsp
Setting up ray-trace acceleration structure... Done (0.08 seconds)
533 faces
208568 square feet [30033910.00 square inches]
0 Displacements
0 Square Feet [0.00 Square Inches]
533 patches before subdivision
5781 patches after subdivision
sun extent from map=0.258819
4 direct lights
BuildFacelights: 0...1...2...3...4...5...6...7...8...9...10 (1)
BuildVisLeafs: 0...1...2...3...4...5...6...7...8...9...10 (0)
transfers 276032, max 281
transfer lists: 2.1 megs
GatherLight: 0...1...2...3...4...5...6...7...8...9...10 (0)
Bounce #1 added RGB(7306, 5549, 4078)
GatherLight: 0...1...2...3...4...5...6...7...8...9...10 (0)
Bounce #2 added RGB(458, 238, 139)
GatherLight: 0...1...2...3...4...5...6...7...8...9...10 (0)
Bounce #3 added RGB(27, 8, 3)
GatherLight: 0...1...2...3...4...5...6...7...8...9...10 (0)
Bounce #4 added RGB(2, 1, 0)
GatherLight: 0...1...2...3...4...5...6...7...8...9...10 (0)
Bounce #5 added RGB(0, 0, 0)
Build Patch/Sample Hash Table(s).....Done<0.0014 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 (0)
Writing leaf ambient...done
Ready to Finish
Object names Objects/Maxobjs Memory / Maxmem Fullness
------------ --------------- --------------- --------
models 7/1024 336/49152 ( 0.7%)
brushes 87/8192 1044/98304 ( 1.1%)
brushsides 677/65536 5416/524288 ( 1.0%)
planes 604/65536 12080/1310720 ( 0.9%)
vertexes 903/65536 10836/786432 ( 1.4%)
nodes 376/65536 12032/2097152 ( 0.6%)
texinfos 71/12288 5112/884736 ( 0.6%)
texdata 9/2048 288/65536 ( 0.4%)
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 533/65536 29848/3670016 ( 0.8%)
hdr faces 0/65536 0/3670016 ( 0.0%)
origfaces 262/65536 14672/3670016 ( 0.4%)
leaves 384/65536 12288/2097152 ( 0.6%)
leaffaces 634/65536 1268/131072 ( 1.0%)
leafbrushes 261/65536 522/131072 ( 0.4%)
areas 2/256 16/2048 ( 0.8%)
surfedges 3620/512000 14480/2048000 ( 0.7%)
edges 1982/256000 7928/1024000 ( 0.8%)
LDR worldlights 4/8192 352/720896 ( 0.0%)
HDR worldlights 0/8192 0/720896 ( 0.0%)
leafwaterdata 0/32768 0/393216 ( 0.0%)
waterstrips 31/32768 310/327680 ( 0.1%)
waterverts 0/65536 0/786432 ( 0.0%)
waterindices 501/65536 1002/131072 ( 0.8%)
cubemapsamples 0/1024 0/16384 ( 0.0%)
overlays 0/512 0/180224 ( 0.0%)
LDR lightdata [variable] 443088/0 ( 0.0%)
HDR lightdata [variable] 0/0 ( 0.0%)
visdata [variable] 10472/16777216 ( 0.1%)
entdata [variable] 10491/393216 ( 2.7%)
LDR ambient table 384/65536 1536/262144 ( 0.6%)
HDR ambient table 384/65536 1536/262144 ( 0.6%)
LDR leaf ambient 1929/65536 54012/1835008 ( 2.9%)
HDR leaf ambient 384/65536 10752/1835008 ( 0.6%)
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] 1/2554 ( 0.0%)
pakfile [variable] 564/0 ( 0.0%)
physics [variable] 36513/4194304 ( 0.9%)
physics terrain [variable] 2/1048576 ( 0.0%)
Level flags = 0
Total triangle count: 1452
Writing c:\program files (x86)\steam\steamapps\common\team fortress 2\sourcesdk_content\tf\mapsrc\koth_drainage_a1.bsp
3 seconds elapsed
** Executing...
** Command: Copy File
** Parameters: "C:\Program Files (x86)\Steam\steamapps\common\Team Fortress 2\sourcesdk_content\tf\mapsrc\koth_drainage_a1.bsp" "C:\Program Files (x86)\Steam\steamapps\common\Team Fortress 2\tf\maps\koth_drainage_a1.bsp"
This is what the error finder has to say:
can't load skybox file skybox/sky_alpinestorm_01 to build the default cubemap!
Description:
You have entered a skybox texture which doesn't seem to be valid. Make sure you don't specify the last three letter (_UP, _DN, etc) of any skybox texture you use. You may also need to fix your vmt files if they are broken. It may also be caused by compiling a non-HDR skybox texture.
However I find this unlikely as 1) when I load the map the skybox is there and 2) I'm using the default sawmill skybox settings.