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This typically happens when iOS calls the PerformFetch method in AppDelegate.
Test case: http://forums.xamarin.com/discussion/comment/47081/#Comment_47081
Unhandled managed exception: Could not find the method 'PerformFetch' in the type 'BackgroundFetchApp.AppDelegate'. (MonoTouch.MonoTouchException)
at MonoTouch.ObjCRuntime.Runtime.FindMethod (IntPtr typeptr, IntPtr methodptr, Int32 paramCount, System.IntPtr* paramptr) [0x0013c] in /work/monotouch/master/monotouch/src/ObjCRuntime/Runtime.cs:320
at MonoTouch.ObjCRuntime.Runtime.GetMethodDirect (IntPtr typeptr, IntPtr methodptr, Int32 paramCount, System.IntPtr* paramptr) [0x00000] in /work/monotouch/master/monotouch/src/ObjCRuntime/Runtime.cs:276
at (wrapper native-to-managed) MonoTouch.ObjCRuntime.Runtime:GetMethodDirect (intptr,intptr,int,intptr*)
at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication:UIApplicationMain (int,string,intptr,intptr)
at MonoTouch.UIKit.UIApplication.Main (System.String args, System.String principalClassName, System.String delegateClassName) [0x0004c] in /work/monotouch/master/monotouch/src/UIKit/UIApplication.cs:38
QA: unit tests were added as well.