Hello everyone,
My partner has developed a cross platform system using Xamarin Studio, after finished it, he sent the project to me by mail.
The project it's ok on my partner enviroment.
When I open the project on my Xamarin Studio the following error appears:
C:\Users\levi.mendes\Documents\Visual Studio 2013\Projects\PCFactory\Xamarin\PCFactoryCross\PCFactoryCross\PCFactoryCross.Droid\MainActivity.cs(13,13): Error CS0012: The type 'System.ComponentModel.INotifyPropertyChanged' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.ObjectModel, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. (CS0012) (PCFactoryCross.Droid)'
What I need to do to fix it?