Question: the type object is defined in an assembly that is not referenced xamarin?
Answer: Forms IOS Project Errors with "The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0. You must add a reference to assembly 'netstandard, Version=2.0. ... 0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'.