Click on Open, locate the Chapter9.Xamarin solution, and open it.
The Solution Explorer should look like this:
Now, expand the Chapter9.Xamarin.AndroidApp project node.
In the Solution Explorer, control (^) + click on the References label and select Edit References.
In the Edit References dialog box, click on the Projects tab.
Check Chapter9.Xamarin.AndroidLib in the list and click OK:
Scroll up until you reach the
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