MvvmLight.Xamarin.Forms is a package that implement INavigationService and IDialogService for Xamarin.Forms. It also extends the navigation service with a OpenModal method.

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Read how to use on http://danielhindrikes.se/xamarin/mvvmlight-navigation-extension/

For Xamarin.Forms use MvvmLight.XamarinForms package. If you still using MvvmLightNavigationServiceExtension.Forms, please read this blog post: http://danielhindrikes.se/xamarin/mvvmlight-navigation-in-xamarin-forms/