Could you post the compile log please?
** 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_waterfront_version_two_skybox_building_tunnel_edit_meh_mega_generator.vmf"
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\koth_waterfront_version_two_skybox_building_tunnel_edit_meh_mega_generator.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)
Chop Details...done (0)
Find Visible Detail Sides...
Merged 102 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_waterfront_version_two_skybox_building_tunnel_edit_meh_mega_generator.prt...Building visibility clusters...
done (0)
*** Error: Skybox vtf files for skybox/sky_island_01 weren't compiled with the same size texture and/or same flags!
Can't load skybox file skybox/sky_island_01 to build the default cubemap!
*** Error: Skybox vtf files for skybox/sky_island_01 weren't compiled with the same size texture and/or same flags!
Can't load skybox file skybox/sky_island_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) (94131 bytes)
Placing detail props : 0...1...2...3...4...5...6...7...8...9...10
Water found with no water_lod_control entity, creating a default one.
Compacting texture/material tables...
Reduced 169 texinfos to 90
Reduced 12 texdatas to 10 (414 bytes to 221)
Writing C:\Program Files (x86)\Steam\steamapps\common\Team Fortress 2\sourcesdk_content\tf\mapsrc\koth_waterfront_version_two_skybox_building_tunnel_edit_meh_mega_generator.bsp
Wrote ZIP buffer, estimated size 1140, actual size 926
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_waterfront_version_two_skybox_building_tunnel_edit_meh_mega_generator"
Valve Software - vvis.exe (Aug 2 2018)
4 threads
reading c:\program files (x86)\steam\steamapps\common\team fortress 2\sourcesdk_content\tf\mapsrc\koth_waterfront_version_two_skybox_building_tunnel_edit_meh_mega_generator.bsp
reading c:\program files (x86)\steam\steamapps\common\team fortress 2\sourcesdk_content\tf\mapsrc\koth_waterfront_version_two_skybox_building_tunnel_edit_meh_mega_generator.prt
218 portalclusters
533 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 (1)
Optimized: 312 visible clusters (0.89%)
Total clusters visible: 35164
Average clusters visible: 161
Building PAS...
Average clusters audible: 218
visdatasize:14026 compressed from 13952
writing c:\program files (x86)\steam\steamapps\common\team fortress 2\sourcesdk_content\tf\mapsrc\koth_waterfront_version_two_skybox_building_tunnel_edit_meh_mega_generator.bsp
1 second 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_waterfront_version_two_skybox_building_tunnel_edit_meh_mega_generator"
Valve Software - vrad.exe SSE (Jul 18 2018)
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_waterfront_version_two_skybox_building_tunnel_edit_meh_mega_generator.bsp
Setting up ray-trace acceleration structure... Done (0.13 seconds)
758 faces
135923 square feet [19572924.00 square inches]
0 Displacements
0 Square Feet [0.00 Square Inches]
758 patches before subdivision
16032 patches after subdivision
sun extent from map=0.000000
23 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 1949795, max 488
transfer lists: 14.9 megs
GatherLight: 0...1...2...3...4...5...6...7...8...9...10 (0)
Bounce #1 added RGB(431709, 158783, 56403)
GatherLight: 0...1...2...3...4...5...6...7...8...9...10 (0)
Bounce #2 added RGB(146337, 23386, 3467)
GatherLight: 0...1...2...3...4...5...6...7...8...9...10 (0)
Bounce #3 added RGB(48252, 3139, 234)
GatherLight: 0...1...2...3...4...5...6...7...8...9...10 (0)
Bounce #4 added RGB(16485, 458, 24)
GatherLight: 0...1...2...3...4...5...6...7...8...9...10 (0)
Bounce #5 added RGB(5638, 64, 2)
GatherLight: 0...1...2...3...4...5...6...7...8...9...10 (0)
Bounce #6 added RGB(1954, 9, 0)
GatherLight: 0...1...2...3...4...5...6...7...8...9...10 (0)
Bounce #7 added RGB(680, 1, 0)
GatherLight: 0...1...2...3...4...5...6...7...8...9...10 (0)
Bounce #8 added RGB(239, 0, 0)
GatherLight: 0...1...2...3...4...5...6...7...8...9...10 (0)
Bounce #9 added RGB(84, 0, 0)
GatherLight: 0...1...2...3...4...5...6...7...8...9...10 (0)
Bounce #10 added RGB(30, 0, 0)
GatherLight: 0...1...2...3...4...5...6...7...8...9...10 (0)
Bounce #11 added RGB(11, 0, 0)
GatherLight: 0...1...2...3...4...5...6...7...8...9...10 (0)
Bounce #12 added RGB(4, 0, 0)
GatherLight: 0...1...2...3...4...5...6...7...8...9...10 (0)
Bounce #13 added RGB(1, 0, 0)
GatherLight: 0...1...2...3...4...5...6...7...8...9...10 (0)
Bounce #14 added RGB(1, 0, 0)
Build Patch/Sample Hash Table(s).....Done<0.0046 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 2/1024 96/49152 ( 0.2%)
brushes 286/8192 3432/98304 ( 3.5%)
brushsides 1951/65536 15608/524288 ( 3.0%)
planes 504/65536 10080/1310720 ( 0.8%)
vertexes 1132/65536 13584/786432 ( 1.7%)
nodes 498/65536 15936/2097152 ( 0.8%)
texinfos 90/12288 6480/884736 ( 0.7%)
texdata 10/2048 320/65536 ( 0.5%)
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 758/65536 42448/3670016 ( 1.2%)
hdr faces 0/65536 0/3670016 ( 0.0%)
origfaces 418/65536 23408/3670016 ( 0.6%)
leaves 501/65536 16032/2097152 ( 0.8%)
leaffaces 986/65536 1972/131072 ( 1.5%)
leafbrushes 826/65536 1652/131072 ( 1.3%)
areas 2/256 16/2048 ( 0.8%)
surfedges 5282/512000 21128/2048000 ( 1.0%)
edges 3226/256000 12904/1024000 ( 1.3%)
LDR worldlights 23/8192 2024/720896 ( 0.3%)
HDR worldlights 0/8192 0/720896 ( 0.0%)
leafwaterdata 1/32768 12/393216 ( 0.0%)
waterstrips 63/32768 630/327680 ( 0.2%)
waterverts 0/65536 0/786432 ( 0.0%)
waterindices 1410/65536 2820/131072 ( 2.2%)
cubemapsamples 0/1024 0/16384 ( 0.0%)
overlays 0/512 0/180224 ( 0.0%)
LDR lightdata [variable] 288896/0 ( 0.0%)
HDR lightdata [variable] 0/0 ( 0.0%)
visdata [variable] 14026/16777216 ( 0.1%)
entdata [variable] 10696/393216 ( 2.7%)
LDR ambient table 501/65536 2004/262144 ( 0.8%)
HDR ambient table 501/65536 2004/262144 ( 0.8%)
LDR leaf ambient 3092/65536 86576/1835008 ( 4.7%)
HDR leaf ambient 501/65536 14028/1835008 ( 0.8%)
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] 1/3832 ( 0.0%)
pakfile [variable] 926/0 ( 0.0%)
physics [variable] 94131/4194304 ( 2.2%)
physics terrain [variable] 2/1048576 ( 0.0%)
Level flags = 0
Total triangle count: 2106
Writing c:\program files (x86)\steam\steamapps\common\team fortress 2\sourcesdk_content\tf\mapsrc\koth_waterfront_version_two_skybox_building_tunnel_edit_meh_mega_generator.bsp
5 seconds elapsed
** Executing...
** Command: Copy File
** Parameters: "C:\Program Files (x86)\Steam\steamapps\common\Team Fortress 2\sourcesdk_content\tf\mapsrc\koth_waterfront_version_two_skybox_building_tunnel_edit_meh_mega_generator.bsp" "C:\Program Files (x86)\Steam\steamapps\common\Team Fortress 2\tf\maps\koth_waterfront_version_two_skybox_building_tunnel_edit_meh_mega_generator.bsp"