iOS app fails to launch when referring to iOS bind library

Native SDK via iOS bind library I would like to refer to it for the Xamarin.iOS project.

on the Mac Visual Studio Build the iOS bind library and
build the generated DLL Added to reference settings in Xamarin.iOS project.
If you write code and debug the interface contained in the DLL,
The application will close as soon as the startup screen appears.

If you created DLLs with only some definitions, such as enum type, in the iOS bind library,
In some cases, the application can be started, but
Otherwise, the app will close.There are no specific exceptions.

I would appreciate it if you could tell me how to deal with it.
Thank you for your cooperation.

Development Environment Windows 10 Visual Studio 2017 15.9.15
Xamarin.iOS and Xamarin.Mac SDK 12.4.0.64
Mac OS Mojave 10.14.6