Need hammer help

[Automatic]

I keep getting the error:

Valve Software - vvis.exe (Aug  4 2010)
Vis Radius = 5000.00
12 threads
reading c:\users\nicholas\desktop\mp_coop_testMap.bsp
reading c:\users\nicholas\desktop\mp_coop_testMap.prt
LoadPortals: couldn't read c:\users\nicholas\desktop\mp_coop_testMap.prt

when compiling, any help?