Audit Workbench "'MSBuild' is not recognized"

AWB and SCA Version  When I start a new project in AWB and choose "visual studio build integration" I receive the following error after the initial scan is complete:

'MSBuild' is not recognized as an internal or external command,
operable program or batch file.

This seems to happen with the translation portion of the scan.  I'm not specifying MSBuild in the scan options so I don't know where it's coming from.  I don't get this error when I initiate a scan from the visual studio plug in, or from the command line.  I also don't get the error when I use AWB to rescan a visual studio project.