Error Compiling Map

I'm not sure what to do. It says Max_Map_Brushsides. I've tried replacing the objects, but it keeps finding new ones. I'm unsure what to do.

As another thing, apparently it can't find where to put the file.

Code:

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8 threads
reading f:\custom mapping\vmex\rp_downtown_v4c_v3_exo.bsp
Error opening f:\custom mapping\vmex\rp_downtown_v4c_v3_exo.bsp


[Reading texlights from 'lights.rad']
[2 texlights parsed from 'lights.rad']

Loading f:\custom mapping\vmex\rp_downtown_v4c_v3_exo.bsp
Error opening f:\custom mapping\vmex\rp_downtown_v4c_v3_exo.bsp


materialPath: F:\Steam\steamapps\common\Counter-Strike Source\cstrike\materials
Loading F:\Custom Mapping\VMEX\rp_downtown_v4c_v3_exo.vmf
ConVarRef mat_reduceparticles doesn't point to an existing ConVar
Brush 88461: nummapbrushes == MAX_MAP_BRUSHES
Side 6
Texture: CS_HAVANA/WOODM

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Error Compiling Map