When I upgrade Xamarin.Forms from 2.3.0 to 3.6.0, I get errors.

Hi everyone,

I have recently upgraded the Xamarin.Forms package from 2.3.0 to 3.6.0 in an existing MVVMCross Xamarin.Forms app.
However, I am receiving errors now in MainApp.cs file of .Droid project.
Error says: Unable to activate instance of type xamarin.forms.platform.android.appcompat.navigationpagerenderer
Are there any particular steps in upgrading the Xamarin.Forms application?