[L4D2] Need help with compile error

[Gemini Saga]

I'm trying to compile a map but it shows a fatal error if I try to run it. Something about "IVP failed" after "Building Physics collision data..." line. Log is below:

Code: Select all

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Running command: cd "c:\program files (x86)\steam\steamapps\common\left 4 dead 2
\bin"
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Running command: "c:\program files (x86)\steam\steamapps\common\left 4 dead 2\bi
n\vbsp.exe" -game "c:\program files (x86)\steam\steamapps\common\left 4 dead 2\l
eft4dead2" "C:\Users\XXX\XXX\\maps vmf for hammer\vmf\XXX.vmf"

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Valve Software - vbsp.exe (Jul  5 2010)
2 threads
materialPath: c:\program files (x86)\steam\steamapps\common\left 4 dead 2\left4d
ead2\materials
Loading C:\XXX\maps vmf for hammer\vmf\XXX.vmf
"materials/nature/blendrockwaterleaves_tooltexture.vtf": cached version doesn't
exist
"materials/plaster/mainstreet_plasterwall01a_tooltexture.vtf": cached version do
esn't exist
Patching WVT material: maps/XXX/nature/blenddirtcorn01_wvt_patch
Patching WVT material: maps/XXX/nature/blenddirtleaves03_wvt_patch
Patching WVT material: maps/XXX/nature/blendrockleaves03_wvt_patch
Patching WVT material: maps/XXX/nature/blendrockleaves_wvt_patch
Patching WVT material: maps/XXX/nature/blendroadleaves01b_wvt_patch
Patching WVT material: maps/XXX/nature/blenddirtleaves03_smalltown_wvt_patc
h
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 (1)
Find Visible Detail Sides...
Merged 6200 detail faces...done (1)
Merging details...Warning: Fell out of small block heap!
done (5)
FixTjuncs...
PruneNodes...
WriteBSP...
done (0)
writing C:\XXX\maps vmf for hammer\vmf\XXX.prt...Bu
ilding visibility clusters...
done (0)
WARNING: node without a volume
Finding displacement neighbors...
Found a displacement edge abutting multiple other edges.
Finding lightmap sample positions...
Displacement Alpha : 0...1...2...3...4...5...6...7...8...9...10
Building Physics collision data...
Couldn't find a matching point to baseline!
IVP Failed at D:\RelDepotBuild\left4dead2\src\ivp\ivp_compact_builder\ivp_object
_polygon_tetra.cxx 833

Finished. Press a key to close.

Thanks.