My apologies. The error occurs in Android; StackTrace:
Object reference not set to an instance of an object.
at Syncfusion.SfRadialMenu.XForms.Droid.SfRadialMenuRenderer.ConvertFormsToNative (Xamarin.Forms.View view, Xamarin.Forms.Rectangle size, Syncfusion.SfRadialMenu.XForms.SfRadialMenu formsRadialMenu) [0x00038] in <c5f4fe2357a6447d82dae27088378d23>:0
at Syncfusion.SfRadialMenu.XForms.Droid.SfRadialMenuMapping.OnRadialMenuPropertiesChanged (System.String propertyName, Syncfusion.SfRadialMenu.XForms.SfRadialMenu formsRadialMenu, Syncfusion.SfRadialMenu.Android.SfRadialMenu nativeRadialMenu) [0x0007b] in <c5f4fe2357a6447d82dae27088378d23>:0
at Syncfusion.SfRadialMenu.XForms.Droid.SfRadialMenuRenderer.OnElementChanged (Xamarin.Forms.Platform.Android.ElementChangedEventArgs`1[TElement] e) [0x00069] in <c5f4fe2357a6447d82dae27088378d23>:0
at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetElement (TElement element) [0x000b1] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:176
at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00027] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:125
at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element, Android.Content.Context context) [0x00024] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\Platform.cs:314
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) [0x00044] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\VisualElementPackager.cs:97
at Xamarin.Forms.Platform.Android.VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement) [0x00104] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\VisualElementPackager.cs:231
at Xamarin.Forms.Platform.Android.VisualElementPackager.Load () [0x00000] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\VisualElementPackager.cs:76
at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager) [0x00007] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:385
at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetElement (TElement element) [0x000ce] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:179
at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00027] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:125
at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element, Android.Content.Context context) [0x00024] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\Platform.cs:314
at Xamarin.Forms.Platform.Android.Platform.AddChild (Xamarin.Forms.VisualElement view, System.Boolean layout) [0x00009] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\Platform.cs:567
at Xamarin.Forms.Platform.Android.Platform.SetPage (Xamarin.Forms.Page newRoot) [0x0007a] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\Platform.cs:453
at Xamarin.Forms.Platform.Android.FormsApplicationActivity.InternalSetPage (Xamarin.Forms.Page page) [0x00052] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\FormsApplicationActivity.cs:220
at Xamarin.Forms.Platform.Android.FormsApplicationActivity.SetMainPage () [0x00000] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\FormsApplicationActivity.cs:239
at Xamarin.Forms.Platform.Android.FormsApplicationActivity.LoadApplication (Xamarin.Forms.Application application) [0x00045] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\FormsApplicationActivity.cs:92
at Sample.Android.MainActivity.OnCreate (Android.OS.Bundle savedInstanceState) [0x0001e] in D:\Visual Studio 2017\Projects\RadialMenuCenterButton\Sample.Android\MainActivity.cs:21