http://developers.de/blogs/damir_dobric/archive/2009/04/10/declarative-workflow-services-4-0-error-xc1008.aspxProblem Description When working with declarative workflow services you may get following error on build: error XC1008: The XAML MSBuild task only processes files that either contain an '{ http://schemas.microsoft.com/winfx/2006/xaml}Directive.Class'enCommunityServer 2008 SP1 (Build: 30619.63)