XF Android : Could not load assembly Microsoft.Windows.Design.Extensibility

Hello ,
I have update Xamarin.Forms to 2.0.0.6490,
But get this exception when compile:

Exception while loading assemblies: System.IO.FileNotFoundException: Could not load assembly 'Microsoft.Windows.Design.Extensibility, Version=4.3.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. Perhaps it doesn't exist in the Mono for Android profile?
文件名:“Microsoft.Windows.Design.Extensibility.dll”
在 Xamarin.Android.Tuner.DirectoryAssemblyResolver.Resolve(AssemblyNameReference reference, ReaderParameters parameters)
在 Xamarin.Android.Tasks.ResolveAssemblies.AddAssemblyReferences(ICollection`1 assemblies, AssemblyDefinition assembly, Boolean topLevel)
在 Xamarin.Android.Tasks.ResolveAssemblies.Execute() UWPTest.Droid

Use Xamarin.Forms 2.0.0.6484 not has this question.
What happened ? Need I references it to Android Project ?

Thanks.