In general, if a section of the compile cannot find the 'file' it is because the VBSP failed and didnt create the file.
Just as a warning, if this is not the first time you compiled a particular map a bsp will exist even when VBSP fails. It does not delete the old file, it will overwrite it. As a result, the VVIS and VRAD will use the old bsp version to compile. Resulting in exactly the same map as you had before. (did that once on a 2+ hour compile)
What I do is watch the compile processing during the VBSP for errors. VBSP runs pretty fast even on larger maps. I think i maxed out at 30ish seconds on a 5 year old computer. So, it doesnt take long. After the VBSP completes then get up and do other things because the rest of the process can take a long long time.
Phil