https://eekayonline.medium.com/fixing-the-xamarin-ios-build-error-mt4109-failed-to-compile-the-generated-registrar-code-8856179427b8
https://eekayonline.medium.com/fixing-the-xamarin-ios-build-error-mt4109-failed-to-compile-the-generated-registrar-code-8856179427b8