Consider adding Monotouch on Unified converted iOS project

I have a project I was working on in 1.2 that I needed to table for a while. I have upgraded XStudio, and converted to Unified. However, my AppDelegate declaration:

[Register ("AppDelegate")]
public partial class AppDelegate : global::Xamarin.Forms.Platform.iOS.FormsApplicationDelegate

gives the following error:

AppDelegate.cs(72,72): Error CS0012: The type MonoTouch.UIKit.UIApplicationDelegate' is defined in an assembly that is not referenced. Consider adding a reference to assemblymonotouch, Version=0.0.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065' (CS0012)

I have removed everything I can to avoid conflicts. Any ideas? I have read all the conversion articles but not found anything.

Thanks!