a freshly started xamarin.forms usuall error for no reasons solved by deleting bin and obj folders and rebuilding solution now everything should be perfect ... i type this in package manager :
Install-Package Naxam.Mapbox.Forms -Version 1.0.5.2
and it gives me this error :
Install-Package : NU1107: Version conflict detected for Xamarin.Android.Support.Fragment. Reference the package directly from the project to resolve this issue. formsMAPapp.Android -> Naxam.Mapbox.Forms 1.0.5.2 -> Naxam.Mapbox.Droid 6.4.0.1 -> Xamarin.Android.Support.Fragment (>= 27.0.2.1) formsMAPapp.Android -> Xamarin.Android.Support.Design 25.4.0.2 -> Xamarin.Android.Support.Fragment (= 25.4.0.2). At line:1 char:1 + Install-Package Naxam.Mapbox.Forms -Version 1.0.5.2 + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : NotSpecified: (:) [Install-Package], Exception + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PackageManagement.PowerShellCmdlets.InstallPackageCommand