A Microsoft framework for building cross-platform mobile apps using .NET and C# with native performance and user interfaces.
Hello,
Welcome to Microsoft Q&A!
May I know have you ever updated XCode recently? The error is probably caused with the old Xamarin.iOS packages.
To solve the problem you can try to reinstall visual studio for mac and update Xamarin.iOS to the latest , and also update visual studio for windows .
Best Regards,
Cole Xia
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