Why when the license reference is installed does the XAML Designer show error message?

[jgfet]

So I started off looking in the MainWindow.xaml of the project **WindowsDockSample** It has the line:

<sample:MainPage />

with the following xmlns:

xmlns:sample="clr-namespace:DevZest.DockSample;assembly=DockSample"

So I go to the MainPage.xaml in the DockSample project and I get the license not installed message.

I have used Nuget to make sure the Devzest license has a reference in both projects
WindowsDockSample and DockSample.

So, why does the screen render this error?

(I clicked on MainPage.xaml and hit the Synch with Active Document (the two-way arrow icon) in the Solution explorer when I took the first screenshot) per this blog post.

FYI: It appears the versions of licensing differ 2 in DockSample, 3 in WindowsDockSample.

I updated the Nuget license to 3. But it still didn't seem to make a difference.