title: I tried to install Xamarin.Android.Support.v4 on Xamarin Project.But it shows errors
body: <p>Severity    Code    Description Project File    Line    Suppression State
  Error       Could not install package 'Xamarin.Android.Support.v4 28.0.0.3'. You are trying to install this package into a project that targets '.NETPortable,Version=v4.5,Profile=Profile78', but the package does not contain any assembly references or content files that are compatible with that framework. For more information, contact the package author.             </p>