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TFS 2010 Build: TF215087 error

If you ever tried to build some custom activities in TFS 2010 Build you’ve probably run into the following  error message:

TF215097: An error occurred while initializing a build for build definition \TeamProject\MyBuildDefinition: Cannot create unknown type '{clr-namespace:[namespace];assembly=[assembly]}Activity

This means that the TFS build service couldn’t create an  instance of the customer workflow activity that is referenced inside your build process template.

So here is a short checklist with some possible reasons:

  • You have checked in the modified version of the XAML workflow.
  • Your custom activity has the the BuildActivityAttribute. 
  • Your custom activity is public.
  • You have configured your build controller with the path in source control where the custom activities are located .
  • Verify that all dependencies for the custom activity assembly/assemblies have been checked into the same location as the assembly.
  • The reference to the custom activity assembly in the XAML workflow is correct.
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