Cannot create HybridWebViewRenderer after upgrade Xamarin.Forms to v4

[gvhung]

Excetion: Sumary: cannot get type of static varian -> static Type webClientType = Type.GetType("Xamarin.Forms.Platform.Android.WebViewRenderer+WebClient, Xamarin.Forms.Platform.Android");

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{System.ArgumentNullException: Value cannot be null.Parameter name: type at System.Activator.CreateInstance (System.Type type, System.Reflection.BindingFlags bindingAttr, System.Reflection.Binder binder, System.Object[] args, System.Globalization.CultureInfo culture, System.Object[] activationAttributes) [0x00003] in :0 at System.Activator.CreateInstance (System.Type type, System.Object[] args) [0x00000] in :0 at HybridKit.Forms.HybridWebViewRenderer.OnElementChanged (Xamarin.Forms.Platform.Android.ElementChangedEventArgs1[TElement] e) [0x00027] in D:\Data\Xamarin\WebViews\HybridKit-master\HybridKit.Android\HybridWebViewRenderer.cs:51 at Xamarin.Forms.Platform.Android.VisualElementRenderer1[TElement].SetElement (TElement element) [0x000b8] in D:\a\1\s\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:230 at Xamarin.Forms.Platform.Android.VisualElementRenderer1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00027] in D:\a\1\s\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:127 at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element, Android.Content.Context context) [0x00044] in D:\a\1\s\Xamarin.Forms.Platform.Android\Platform.cs:345 at Xamarin.Forms.Platform.Android.VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, Xamarin.Forms.Platform.Android.IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, System.Boolean sameChildren) [0x000af] in D:\a\1\s\Xamarin.Forms.Platform.Android\VisualElementPackager.cs:138 at Xamarin.Forms.Platform.Android.VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement) [0x00139] in D:\a\1\s\Xamarin.Forms.Platform.Android\VisualElementPackager.cs:334 at Xamarin.Forms.Platform.Android.VisualElementPackager.Load () [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.Android\VisualElementPackager.cs:110 at Xamarin.Forms.Platform.Android.VisualElementRenderer1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager) [0x00007] in D:\a\1\s\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:439 at Xamarin.Forms.Platform.Android.VisualElementRenderer1[TElement].SetElement (TElement element) [0x000d5] in D:\a\1\s\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:233 at Xamarin.Forms.Platform.Android.VisualElementRenderer1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00027] in D:\a\1\s\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:127 at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element, Android.Content.Context context) [0x00044] in D:\a\1\s\Xamarin.Forms.Platform.Android\Platform.cs:345 at Xamarin.Forms.Platform.Android.Platform.AddChild (Xamarin.Forms.VisualElement view, System.Boolean layout) [0x00009] in D:\a\1\s\Xamarin.Forms.Platform.Android\Platform.cs:615 at Xamarin.Forms.Platform.Android.Platform.SetPage (Xamarin.Forms.Page newRoot) [0x00084] in D:\a\1\s\Xamarin.Forms.Platform.Android\Platform.cs:496 at Xamarin.Forms.Platform.Android.FormsApplicationActivity.InternalSetPage (Xamarin.Forms.Page page) [0x00052] in D:\a\1\s\Xamarin.Forms.Platform.Android\FormsApplicationActivity.cs:251 at Xamarin.Forms.Platform.Android.FormsApplicationActivity.SetMainPage () [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.Android\FormsApplicationActivity.cs:270 at Xamarin.Forms.Platform.Android.FormsApplicationActivity.LoadApplication (Xamarin.Forms.Application application) [0x0005f] in D:\a\1\s\Xamarin.Forms.Platform.Android\FormsApplicationActivity.cs:94 at KitchenSink.Forms.Android.MainActivity.OnCreate (Android.OS.Bundle bundle) [0x00017] in D:\Data\Xamarin\WebViews\HybridKit-master\Samples\KitchenSink\KitchenSink.Forms.Android\MainActivity.cs:25 at Android.App.Activity.n_OnCreate_Landroid_os_Bundle_ (System.IntPtr jnienv, System.IntPtr native__this, System.IntPtr native_savedInstanceState) [0x00011] in <3324153164274220ab14392825330ba2>:0 at (wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.8(intptr,intptr,intptr)}

Please help me fix it, thanks.