How fix bug : System.ArgumentException'jobject' must not be IntPtr.Zero. Parameter name: jobject
Android.Runtime.JNIEnv.CallVoidMethod(intptr,intptr,Android.Runtime.JValue[])
Android.Widget.TextView.set_TextFormatted(Java.Lang.ICharSequence)
Android.Widget.TextView.set_Text(string)
Xamarin.Forms.Platform.Android.ButtonRenderer.UpdateText()
Xamarin.Forms.Platform.Android.ButtonRenderer.OnElementPropertyChanged(object,System.ComponentModel.PropertyChangedEventArgs)
Xamarin.Forms.BindableObject.OnPropertyChanged(string)
Xamarin.Forms.BindableObject.SetValueActual(Xamarin.Forms.BindableProperty,object,bool,bool,bool)
Xamarin.Forms.BindableObject.SetValueCore(Xamarin.Forms.BindableProperty,object,bool,bool,bool)
Xamarin.Forms.BindingExpression.ApplyCore(object,Xamarin.Forms.BindableObject,Xamarin.Forms.BindableProperty,bool)
Xamarin.Forms.BindingExpression.Apply(bool)
Xamarin.Forms.BindingExpression/BindingExpressionPart.<PropertyChanged>b__12()
Java.Lang.Thread/RunnableImplementor.Run()
Java.Lang.IRunnableInvoker.n_Run(intptr,intptr)