Have you recently attempted to use the Microsoft.BizTalk.TestTools.Mapper.TestableMapBase (This class enables you to test BizTalk maps programmatically through MSTest or NUnit) on the build server as a CI process or otherwise through some sort of test harness, if so, you might have received the following error:
System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.BizTalk.TOM, Version=18.104.22.168, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.
This was happening in a new development environment during the execution of MSTest unit tests against BizTalk 2010 Developer Edition and a Team Foundation 2010 build during a CI build process.
After searching around and reading various blog posts, I couldn't find the solution other than to repair BizTalk. This sounded rather drastic to fix a simple error. So I then decided to do the normal thing a .NET developer would do and check the GAC for the file Microsoft.BizTalk.TOM. I failed to find it so I guess the BizTalk installation must have failed somewhere, as I didn't install BizTalk on that machine it's hard to know.
So I then decided to GAC the file. Looking for GACUTIL.exe, I soon realised and remembered that GACUTIL is not supplied with the .NET Framework. As this was a build server, I didn't have Visual Studio installed. Then I remembered I installed the Windows Server SDK v6.1 on this machine so that I could actually build code and run tests (due to various build targets that comes with the Windows Server SDK). When you install the Windows SDK it comes with a CMD.cmd file and GACUTIL.exe (among other things) that sets up the environment ready to use the various tools.
So to fix this missing assembly issue:
1. if you don't have the Windows SDK installed install it (latest version at the time of writing is
2. Once the SDK is installed, run this: C:\Windows\System32\cmd.exe /E:ON /V:ON /T:0E /K "D:\Program Files\Microsoft SDKs\Windows\v6.1\Bin\SetEnv.Cmd" This is assuming you have installed the SDK on a drive D.
3. Run the following command: GACUTIL C:\Program Files (x86)\Common Files\Microsoft BizTalk\Microsoft.BizTalk.TOM.dll -i
Queue a build, or attempt to run the app using the map test class and all should be well (unless you have other issues!)