Now that\'s a real strange error. I am working on a WPF application and following MVVM. In my MainWindow I am setting views and view models and I get this strange error. Alt
I had the same problem. I'd used Intellisense to build the namespace mapping and it had not included the assembly attribute, so it looked like this:
xmlns:converters="clr-namespace:XYZ.UI.Converters;
when I compared it to a working Behavior in another window, I spotted the difference. When I changed it to
xmlns:converters="clr-namespace:XYZ.UI.Converters;assembly=XYZ.UI"
cleaned it and built it, it worked.