Error MT2002

Xamarin Forms project, visual studio 2017 15.9.4. I compile a project with connection to macbook.
C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(795,3): error MT2002: Can not resolve reference: /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/System.Resources.Reader.dll