Flickering build (rake to build a .NET solution)

I have a build that is flickering.  I'm using the rake runner to build a .NET solution using a set of tasks that I've written - http://my-svn.assembla.com/svn/nrws/trunk/rake_dotnet .  I sometimes get a fail with a log like [1].  Other times I get a pass.  Same agent is running the config.  ...Why?
Please let me know if there's anything else you need?
I attached the msbuild.rb and flicker.txt (the full log) once I discovered that pre code tags here don't do what I expected and preserve newlines :(



Attachment(s):
flicker.txt
msbuild.rb
5 comments
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I saw in your build log:

Could not locate the expected version of the Microsoft Windows SDK.
Looked for a location specified in the "InstallationFolder" value of
the registry key "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SDKs\Windows\v6.0A".
If your build process does not need the SDK then this can be ignored.
Otherwise you can solve the problem by doing one of the following:
  1) Install the Microsoft Windows SDK for Windows Server 2008 and .NET Framework 3.5.
  2) Install Visual Studio 2008.
  3) Manually set the above registry key to the correct location.


Could this issue be related to the absence of VS on the build agent machine?
Thanks!

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Hi Eugene - thanks, but that's not it; if it were, the build would fail consistently, instead of sometimes-pass, sometimes-fail.

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How much build agents do you use for that build configuration?

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There are three agents, all compatible with the config.  The config has been, for whatever reason, running on only one agent.  I can't reproduce the flicker on any of the agents, it seems to only happen via code being checked in.

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Could you please enshure that all those flichers was on the same build agent.
Were there any chanages in software of the build agent?
Thanks!

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