[MonoTouch] NSNotificationCenter Warning

[Andrew Young]

 Why am I getting this warning? 

"Warning CS0618: `MonoTouch.Foundation.NSNotificationCenter.AddObserver(string, System.Action<MonoTouch.Foundation.NSNotification>)' is obsolete: `Use AddObserver(NSSstring, Action<NSNotification>) instead'"

I don't see the difference between the two calls. The only difference is that the former is fully namespaced. The latter is not. Please tell me I'm wrong.
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