[0:] System.ArgumentException: 'jobject' must not be IntPtr.Zero. Parameter name: jobject at Android.Runtime.JNIEnv.CallVoidMethod (IntPtr jobject, IntPtr jmethod, Android.Runtime.JValue[] parms) [0x00010] in /Users/builder/data/lanes/monodroid-mlion-monodroid-4.21-series/38ac51a9/source/monodroid/src/Mono.Android/src/Runtime/JNIEnv.g.cs:500 at Android.Views.View.Measure (Int32 widthMeasureSpec, Int32 heightMeasureSpec) [0x0002d] in /Users/builder/data/lanes/monodroid-mlion-monodroid-4.21-series/38ac51a9/source/monodroid/src/Mono.Android/platforms/android-21/src/generated/Android.Views.View.cs:13279 at Xamarin.Forms.Platform.Android.ViewRenderer`2[Xamarin.Forms.Image,Android.Widget.ImageView].GetDesiredSize (Int32 widthConstraint, Int32 heightConstraint) [0x00000] in :0 at Xamarin.Forms.Platform.Android.Platform.GetNativeSize (Xamarin.Forms.VisualElement view, Double widthConstraint, Double heightConstraint) [0x00000] in :0 at Xamarin.Forms.VisualElement.OnSizeRequest (Double widthConstraint, Double heightConstraint) [0x00000] in :0 at Xamarin.Forms.Image.OnSizeRequest (Double widthConstraint, Double heightConstraint) [0x00000] in :0 at Xamarin.Forms.VisualElement.GetSizeRequest (Double widthConstraint, Double heightConstraint) [0x00000] in :0 at Xamarin.Forms.Layout.LayoutChildIntoBoundingRegion (Xamarin.Forms.VisualElement child, Rectangle region) [0x00000] in :0 at Xamarin.Forms.Grid.LayoutChildren (Double x, Double y, Double width, Double height) [0x00000] in :0 at Xamarin.Forms.Layout.UpdateChildrenLayout () [0x00000] in :0 at Xamarin.Forms.Layout.OnSizeAllocated (Double width, Double height) [0x00000] in :0 at Xamarin.Forms.VisualElement.SizeAllocated (Double width, Double height) [0x00000] in :0 at Xamarin.Forms.Layout.OnChildMeasureInvalidated () [0x00000] in :0 at Xamarin.Forms.Layout.OnChildMeasureInvalidated (System.Object sender, System.EventArgs e) [0x00000] in :0 at Xamarin.Forms.VisualElement.InvalidateMeasure () [0x00000] in :0 at Xamarin.Forms.Image.OnSourcePropertyChanged (Xamarin.Forms.ImageSource oldvalue, Xamarin.Forms.ImageSource newvalue) [0x00000] in :0 at Xamarin.Forms.Image.<.cctor>b__1 (Xamarin.Forms.BindableObject bindable, System.Object oldvalue, System.Object newvalue) [0x00000] in :0 at Xamarin.Forms.BindableObject.SetValueActual (Xamarin.Forms.BindableProperty property, Xamarin.Forms.BindablePropertyContext context, System.Object value, Boolean currentlyApplying, SetValueFlags attributes, Boolean silent) [0x00000] in :0 at Xamarin.Forms.BindableObject.SetValueCore (Xamarin.Forms.BindableProperty property, System.Object value, SetValueFlags attributes, SetValuePrivateFlags privateAttributes) [0x00000] in :0 at Xamarin.Forms.BindingExpression.ApplyCore (System.Object sourceObject, Xamarin.Forms.BindableObject target, Xamarin.Forms.BindableProperty property, Boolean fromTarget) [0x00000] in :0 at Xamarin.Forms.BindingExpression.Apply (System.Object sourceObject, Xamarin.Forms.BindableObject target, Xamarin.Forms.BindableProperty property) [0x00000] in :0 at Xamarin.Forms.Binding.Apply (System.Object newContext, Xamarin.Forms.BindableObject bindObj, Xamarin.Forms.BindableProperty targetProperty) [0x00000] in :0 at Xamarin.Forms.BindableObject.ApplyBindings (System.Object oldContext, Boolean skipBindingContext) [0x00000] in :0 at Xamarin.Forms.BindableObject.ApplyBindings (System.Object oldContext) [0x00000] in :0 at Xamarin.Forms.BindableObject.SetInheritedBindingContext (Xamarin.Forms.BindableObject bindable, System.Object value) [0x00000] in :0 at Xamarin.Forms.Element.OnBindingContextChanged () [0x00000] in :0 at Xamarin.Forms.View.OnBindingContextChanged () [0x00000] in :0 at Xamarin.Forms.Grid.OnBindingContextChanged () [0x00000] in :0 at Xamarin.Forms.BindableObject.SetInheritedBindingContext (Xamarin.Forms.BindableObject bindable, System.Object value) [0x00000] in :0 at Xamarin.Forms.Element.OnBindingContextChanged () [0x00000] in :0 at Xamarin.Forms.View.OnBindingContextChanged () [0x00000] in :0 at Xamarin.Forms.BindableObject.SetInheritedBindingContext (Xamarin.Forms.BindableObject bindable, System.Object value) [0x00000] in :0 at Xamarin.Forms.Element.OnBindingContextChanged () [0x00000] in :0 at Xamarin.Forms.View.OnBindingContextChanged () [0x00000] in :0 at Xamarin.Forms.BindableObject.SetInheritedBindingContext (Xamarin.Forms.BindableObject bindable, System.Object value) [0x00000] in :0 at Xamarin.Forms.Element.OnBindingContextChanged () [0x00000] in :0 at Xamarin.Forms.Cell.OnBindingContextChanged () [0x00000] in :0 at Xamarin.Forms.BindableObject.BindingContextPropertyBindingPropertyChanged (Xamarin.Forms.BindableObject bindable, System.Object oldvalue, System.Object newvalue) [0x00000] in :0 at Xamarin.Forms.BindableObject.SetValueActual (Xamarin.Forms.BindableProperty property, Xamarin.Forms.BindablePropertyContext context, System.Object value, Boolean currentlyApplying, SetValueFlags attributes, Boolean silent) [0x00000] in :0 at Xamarin.Forms.BindableObject.SetValueCore (Xamarin.Forms.BindableProperty property, System.Object value, SetValueFlags attributes, SetValuePrivateFlags privateAttributes) [0x00000] in :0 at Xamarin.Forms.BindableObject.SetValue (Xamarin.Forms.BindableProperty property, System.Object value, Boolean fromStyle, Boolean checkAccess) [0x00000] in :0 at Xamarin.Forms.BindableObject.SetValue (Xamarin.Forms.BindableProperty property, System.Object value) [0x00000] in :0 at Xamarin.Forms.BindableObject.set_BindingContext (System.Object value) [0x00000] in :0 at Xamarin.Forms.TemplatedItemsList`2[Xamarin.Forms.ItemsView`1[Xamarin.Forms.Cell],Xamarin.Forms.Cell].UnhookItem (Xamarin.Forms.Cell item) [0x00000] in :0 at Xamarin.Forms.TemplatedItemsList`2[Xamarin.Forms.ItemsView`1[Xamarin.Forms.Cell],Xamarin.Forms.Cell].OnProxyCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e, Boolean fixWindows) [0x00000] in :0 at Xamarin.Forms.TemplatedItemsList`2[Xamarin.Forms.ItemsView`1[Xamarin.Forms.Cell],Xamarin.Forms.Cell].OnProxyCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00000] in :0 at Xamarin.Forms.ListProxy.OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00000] in :0 at Xamarin.Forms.ListProxy+<>c__DisplayClassc.b__8 () [0x00000] in :0 at Xamarin.Forms.ListProxy.OnCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00000] in :0 at Xamarin.Forms.ListProxy+WeakNotifyProxy.OnCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00000] in :0 at (wrapper delegate-invoke) :invoke_void_object_NotifyCollectionChangedEventArgs (object,System.Collections.Specialized.NotifyCollectionChangedEventArgs) at System.Collections.ObjectModel.ObservableCollection`1[Restaurent.DataModel.cm_items].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00000] in :0 at System.Collections.ObjectModel.ObservableCollection`1[Restaurent.DataModel.cm_items].RemoveItem (Int32 index) [0x00000] in :0 at System.Collections.ObjectModel.Collection`1[Restaurent.DataModel.cm_items].Remove (Restaurent.DataModel.cm_items item) [0x00000] in :0 at Restaurent.Cell.CartCell+ctor>b__17>d__1d.MoveNext () [0x000b3] in d:\new_back\oct\22-10-2015\XFormsContosoCookbook1\XFormsContosoCookbook\XFormsContosoCookbook\Cell\CartCell.cs:44 10-22 02:27:21.722 I/mono-stdout( 2507): at Xamarin.Forms.View.OnBindingContextChanged () [0x00000] in :0 10-22 02:27:21.722 I/mono-stdout( 2507): at Xamarin.Forms.BindableObject.SetInheritedBindingContext (Xamarin.Forms.BindableObject bindable, System.Object value) [0x00000] in :0 10-22 02:27:21.722 I/mono-stdout( 2507): at Xamarin.Forms.Element.OnBindingContextChanged () [0x00000] in :0 10-22 02:27:21.722 I/mono-stdout( 2507): at Xamarin.Forms.Cell.OnBindingContextChanged () [0x00000] in :0 10-22 02:27:21.723 I/mono-stdout( 2507): at Xamarin.Forms.BindableObject.BindingContextPropertyBindingPropertyChanged (Xamarin.Forms.BindableObject bindable, System.Object oldvalue, System.Object newvalue) [0x00000] in :0 10-22 02:27:21.723 I/mono-stdout( 2507): at Xamarin.Forms.BindableObject.SetValueActual (Xamarin.Forms.BindableProperty property, Xamarin.Forms.BindablePropertyContext context, System.Object value, Boolean currentlyApplying, SetValueFlags attributes, Boolean silent) [0x00000] in :0 10-22 02:27:21.723 I/mono-stdout( 2507): at Xamarin.Forms.BindableObject.SetValueCore (Xamarin.Forms.BindableProperty property, System.Object value, SetValueFlags attributes, SetValuePrivateFlags privateAttributes) [0x00000] in :0 10-22 02:27:21.723 I/mono-stdout( 2507): at Xamarin.Forms.BindableObject.SetValue (Xamarin.Forms.BindableProperty property, System.Object value, Boolean fromStyle, Boolean checkAccess) [0x00000] in :0 10-22 02:27:21.723 I/mono-stdout( 2507): at Xamarin.Forms.BindableObject.SetValue (Xamarin.Forms.BindableProperty property, System.Object value) [0x00000] in :0 10-22 02:27:21.723 I/mono-stdout( 2507): at Xamarin.Forms.BindableObject.set_BindingContext (System.Object value) [0x00000] in :0 10-22 02:27:21.723 I/mono-stdout( 2507): at Xamarin.Forms.TemplatedItemsList`2[Xamarin.Forms.ItemsView`1[Xamarin.Forms.Cell],Xamarin.Forms.Cell].UnhookItem (Xamarin.Forms.Cell item) [0x00000] in :0 10-22 02:27:21.723 I/mono-stdout( 2507): at Xamarin.Forms.TemplatedItemsList`2[Xamarin.Forms.ItemsView`1[Xamarin.Forms.Cell],Xamarin.Forms.Cell].OnProxyCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e, Boolean fixWindows) [0x00000] in :0 10-22 02:27:21.723 I/mono-stdout( 2507): at Xamarin.Forms.TemplatedItemsList`2[Xamarin.Forms.ItemsView`1[Xamarin.Forms.Cell],Xamarin.Forms.Cell].OnProxyCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00000] in :0 10-22 02:27:21.723 I/mono-stdout( 2507): at Xamarin.Forms.ListProxy.OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00000] in :0 10-22 02:27:21.723 I/mono-stdout( 2507): at Xamarin.Forms.ListProxy+<>c__DisplayClassc.b__8 () [0x00000] in :0 10-22 02:27:21.723 I/mono-stdout( 2507): at Xamarin.Forms.ListProxy.OnCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00000] in :0 10-22 02:27:21.723 I/mono-stdout( 2507): at Xamarin.Forms.ListProxy+WeakNotifyProxy.OnCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00000] in :0 10-22 02:27:21.723 I/mono-stdout( 2507): at (wrapper delegate-invoke) :invoke_void_object_NotifyCollectionChangedEventArgs (object,System.Collections.Specialized.NotifyCollectionChangedEventArgs) 10-22 02:27:21.723 I/mono-stdout( 2507): at System.Collections.ObjectModel.ObservableCollection`1[Restaurent.DataModel.cm_items].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00000] in :0 10-22 02:27:21.723 I/mono-stdout( 2507): at System.Collections.ObjectModel.ObservableCollection`1[Restaurent.DataModel.cm_items].RemoveItem (Int32 index) [0x00000] in :0 10-22 02:27:21.723 I/mono-stdout( 2507): at System.Collections.ObjectModel.Collection`1[Restaurent.DataModel.cm_items].Remove (Restaurent.DataModel.cm_items item) [0x00000] in :0 10-22 02:27:21.723 I/mono-stdout( 2507): at Restaurent.Cell.CartCell+ctor>b__17>d__1d.MoveNext () [0x000b3] in d:\new_back\oct\22-10-2015\XFormsContosoCookbook1\XFormsContosoCookbook\XFormsContosoCookbook\Cell\CartCell.cs:44 An unhandled exception occured.