Ms.Net Solution file Error: "Object reference not set to an instance of an object"

[chrisk]

I am trying to build using the MS.Net Action. I get the following:

"Error loading info for project file 'W:\Development\BPrototype\BTest\BTest.vcproj': Object reference not set to an instance of an object."

When trying to build a debug build.

My Install Info:
Visual Build Professional 5.6a
Evaluation Version: 46 uses remaining
Windows Version: 5.1.2600.2.0
Install path: C:\Program Files\VisBuildPro
cmax20u.dll version 2.1.0.21
SftTree_IX86_U_50.dll version 5.01
unins000.exe version 51.15.0.0
VisBuildBld.dll version 5.6.1.1
VisBuildCmd.exe version 5.6.1.1
VisBuildCore.dll version 5.6.1.1
VisBuildDotNET.dll version 5.6.1.1
VisBuildExt.dll version 5.6.1.1
VisBuildLog.dll version 5.6.1.1
VisBuildMisc.dll version 5.6.1.1
VisBuildMS.dll version 5.6.1.1
VisBuildNet.dll version 5.6.1.1
VisBuildPro.exe version 5.6.1.1
VisBuildSvr.dll version 5.6.1.1

Ideas/Suggestions