(XAML)"XXXX" does not exist in the namespace "clr-

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Error 139 Assembly ‘System.Activities.Core.Presentation‘ was not found. Verify that you are not missing an assembly reference. Also, verify that your project and all referenced assemblies have been built. EnumerationTestDesigner.xaml 6 17 LoganTests
Error 138 XXXXXXXXThe name "DesignerStylesDictionary" does not exist in the namespace "clr-namespace:System.Activities.Core.Presentation.Themes;assembly=System.Activities.Core.Presentation". 

原因很简单，工程文件中没有引用‘System.Activities.Core.Presentation‘

(XAML)"XXXX" does not exist in the namespace "clr-

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原文地址：http://www.cnblogs.com/fdyang/p/4651007.html