ANT scripts – Visual Studio Installer project : Error : HRESULT = ‘8000000A’

We are having problems running an ANT script that uses MS Visual Studio 2017 on a Windows 8.1 build machine.

We have got a Build Engine running OK on this Build machine and the files are successfully loaded onto this machine from the RTC server.

The ‘.sln’ file has a couple of projects which are built successfully within Visual Studio but then we get problems when we try to build an Installer project.

The error is :
--- Starting pre-build validation for ‘<projectname>_Installer’
ERROR: An error occurred while validating: HRESULT = ‘8000000A’.

We have tried a suggestion to edit the registry key for the user who is performing the build:

 set HKEY_CURRENT_USER\SOFTWARE.....\MSBuild     EnableOutOfProcBuild = 0

but that didn’t make any difference.

Does anybody have any suggestions as to how we can proceed ?

Thanks

Peter