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

Source: Internet
Author: User
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Error 139 Assembly ' System.Activities.Core.Presentation ' is not found. Verify that's missing an assembly reference. Also, verify that your project and all referenced assemblies has been built. Enumerationtestdesigner.xaml 6 logantests
Error 138 xxxxxxxxthe Name "Designerstylesdictionary" does not exist in the namespace "clr-namespace:system.activities.co Re. Presentation.themes;assembly=system.activities.core.presentation ".

The reason is simple, there is no reference to ' System.Activities.Core.Presentation ' in the project file

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

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