The name “Interaction” does not exist in the namespace “http://schemas.microsoft.com/expression/2010/interactivity”

Remove any project reference to Microsoft.Expression.Interactions and System.Windows.Interactivity.

Install through Nuget the newer Microsoft.Xaml.Behaviors.Wpf, which replaces the aforementioned references, i.e. open the Package Manager console and type:

Install-Package Microsoft.Xaml.Behaviors.Wpf ProjectName

In the Xaml-files, replace the xmlns namespaces http://schemas.microsoft.com/expression/2010/interactivity and http://schemas.microsoft.com/expression/2010/interactions with http://schemas.microsoft.com/xaml/behaviors