at Xamarin.Forms.Platform.MacOS.EntryRenderer+FormsNSTextField.HandleWindowDidBecomeKey (System.Object sender, System.EventArgs args) [0x0000c] in <e8fa852365fa4d5399d580ab2b5d60ba>:0
  at AppKit.NSWindow+_NSWindowDelegate.DidBecomeKey (Foundation.NSNotification notification) [0x00011] in /Library/Frameworks/Xamarin.Mac.framework/Versions/4.4.1.178/src/Xamarin.Mac/AppKit/NSWindow.g.cs:11330
  at (wrapper managed-to-native) ObjCRuntime.Messaging.nint_objc_msgSend_IntPtr(intptr,intptr,intptr)
  at AppKit.NSApplication.RunModalForWindow (AppKit.NSWindow theWindow) [0x00025] in /Library/Frameworks/Xamarin.Mac.framework/Versions/4.4.1.178/src/Xamarin.Mac/AppKit/NSApplication.g.cs:2219
  at AppKit.NSAlert.RunSheetModal (AppKit.NSWindow window, AppKit.NSApplication application) [0x0005b] in /Library/Frameworks/Xamarin.Mac.framework/Versions/4.4.1.178/src/Xamarin.Mac/AppKit/NSAlert.cs:107
  at AppKit.NSAlert.RunSheetModal (AppKit.NSWindow window) [0x00001] in /Library/Frameworks/Xamarin.Mac.framework/Versions/4.4.1.178/src/Xamarin.Mac/AppKit/NSAlert.cs:88
  at Xamarin.Forms.Platform.MacOS.Platform.<.ctor>b__5_0 (Xamarin.Forms.Page sender, Xamarin.Forms.Internals.AlertArguments arguments) [0x0002e] in <e8fa852365fa4d5399d580ab2b5d60ba>:0
  at (wrapper managed-to-native) System.Reflection.MonoMethod.InternalInvoke(System.Reflection.MonoMethod,object,object[],System.Exception&)
  at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00032] in /Library/Frameworks/Xamarin.Mac.framework/Versions/4.4.1.178/src/Xamarin.Mac/mcs/class/corlib/System.Reflection/MonoMethod.cs:305