macOS error: Could not create an native instance of the type 'MonoMac.WebKit.WebView'

[sandreas]

Hi, I tried the Sample project on macOS Monterey (12.6.3) and the following error occured. Am I doing something wrong?

Let me know if I can support you with the macOS implementation, I would be glad to help...

Unhandled exception. System.Exception: Could not create an native instance of the type 'MonoMac.WebKit.WebView': the native class hasn't been loaded.
It is possible to ignore this condition by setting MonoMac.ObjCRuntime.Class.ThrowOnInitFailure to false.
   at MonoMac.Foundation.NSObject.InitializeObject(Boolean alloced)
   at MonoMac.Foundation.NSObject..ctor(NSObjectFlag x)
   at MonoMac.AppKit.NSResponder..ctor(NSObjectFlag t)
   at MonoMac.AppKit.NSView..ctor(NSObjectFlag t)
   at MonoMac.WebKit.WebView..ctor()
   at AvaloniaWebView.MacWebViewAdapter..ctor() in /Users/andreas/Projects/AvaloniaWebView/src/AvaloniaWebView/Mac/MacWebViewAdapter.cs:line 22
   at AvaloniaWebView.NativeWebView.CreateNativeControlCore(IPlatformHandle parent) in /Users/andreas/Projects/AvaloniaWebView/src/AvaloniaWebView/NativeWebView.cs:line 108
   at Avalonia.Controls.NativeControlHost.<UpdateHost>b__10_0(IPlatformHandle parent) in /_/src/Avalonia.Controls/NativeControlHost.cs:line 96
   at Avalonia.Native.NativeControlHostImpl.CreateNewAttachment(Func`2 create) in /_/src/Avalonia.Native/NativeControlHostImpl.cs:line 59
   at Avalonia.Controls.NativeControlHost.UpdateHost() in /_/src/Avalonia.Controls/NativeControlHost.cs:line 95
   at Avalonia.Visual.OnAttachedToVisualTreeCore(VisualTreeAttachmentEventArgs e) in /_/src/Avalonia.Visuals/Visual.cs:line 403
   at Avalonia.Layout.Layoutable.OnAttachedToVisualTreeCore(VisualTreeAttachmentEventArgs e) in /_/src/Avalonia.Layout/Layoutable.cs:line 743
   at Avalonia.Input.InputElement.OnAttachedToVisualTreeCore(VisualTreeAttachmentEventArgs e) in /_/src/Avalonia.Input/InputElement.cs:line 509
   at Avalonia.Controls.Control.OnAttachedToVisualTreeCore(VisualTreeAttachmentEventArgs e) in /_/src/Avalonia.Controls/Control.cs:line 174
   at Avalonia.Visual.SetVisualParent(Visual value) in /_/src/Avalonia.Visuals/Visual.cs:line 604
   at Avalonia.Visual.SetVisualParent(IList children, Visual parent) in /_/src/Avalonia.Visuals/Visual.cs:line 642
   at Avalonia.Visual.VisualChildrenChanged(Object sender, NotifyCollectionChangedEventArgs e) in /_/src/Avalonia.Visuals/Visual.cs:line 622
   at Avalonia.Collections.AvaloniaList`1.NotifyAdd(T item, Int32 index) in /_/src/Avalonia.Base/Collections/AvaloniaList.cs:line 681
   at Avalonia.Collections.AvaloniaList`1.Add(T item) in /_/src/Avalonia.Base/Collections/AvaloniaList.cs:line 205
   at Avalonia.Controls.Presenters.ContentPresenter.UpdateChild() in /_/src/Avalonia.Controls/Presenters/ContentPresenter.cs:line 298
   at Avalonia.Controls.Presenters.ContentPresenter.ApplyTemplate() in /_/src/Avalonia.Controls/Presenters/ContentPresenter.cs:line 239
   at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 554
   at Avalonia.Layout.Layoutable.Measure(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 364
   at Avalonia.Controls.DockPanel.MeasureOverride(Size constraint) in /_/src/Avalonia.Controls/DockPanel.cs:line 112
   at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 559
   at Avalonia.Layout.Layoutable.Measure(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 364
   at Avalonia.Layout.LayoutHelper.MeasureChild(ILayoutable control, Size availableSize, Thickness padding) in /_/src/Avalonia.Layout/LayoutHelper.cs:line 46
   at Avalonia.Layout.LayoutHelper.MeasureChild(ILayoutable control, Size availableSize, Thickness padding, Thickness borderThickness) in /_/src/Avalonia.Layout/LayoutHelper.cs:line 39
   at Avalonia.Controls.Border.MeasureOverride(Size availableSize) in /_/src/Avalonia.Controls/Border.cs:line 187
   at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 559
   at Avalonia.Layout.Layoutable.Measure(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 364
   at Avalonia.Layout.Layoutable.MeasureOverride(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 625
   at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 559
   at Avalonia.Layout.Layoutable.Measure(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 364
   at Avalonia.Layout.LayoutHelper.MeasureChild(ILayoutable control, Size availableSize, Thickness padding) in /_/src/Avalonia.Layout/LayoutHelper.cs:line 46
   at Avalonia.Layout.LayoutHelper.MeasureChild(ILayoutable control, Size availableSize, Thickness padding, Thickness borderThickness) in /_/src/Avalonia.Layout/LayoutHelper.cs:line 39
   at Avalonia.Controls.Presenters.ContentPresenter.MeasureOverride(Size availableSize) in /_/src/Avalonia.Controls/Presenters/ContentPresenter.cs:line 366
   at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 559
   at Avalonia.Layout.Layoutable.Measure(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 364
   at Avalonia.Layout.LayoutHelper.MeasureChild(ILayoutable control, Size availableSize, Thickness padding) in /_/src/Avalonia.Layout/LayoutHelper.cs:line 46
   at Avalonia.Controls.Primitives.VisualLayerManager.MeasureOverride(Size availableSize) in /_/src/Avalonia.Controls/Primitives/VisualLayerManager.cs:line 133
   at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 559
   at Avalonia.Layout.Layoutable.Measure(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 364
   at Avalonia.Layout.Layoutable.MeasureOverride(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 625
   at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 559
   at Avalonia.Layout.Layoutable.Measure(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 364
   at Avalonia.Layout.Layoutable.MeasureOverride(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 625
   at Avalonia.Controls.Window.MeasureOverride(Size availableSize) in /_/src/Avalonia.Controls/Window.cs:line 888
   at Avalonia.Controls.WindowBase.MeasureCore(Size availableSize) in /_/src/Avalonia.Controls/WindowBase.cs:line 243
   at Avalonia.Layout.Layoutable.Measure(Size availableSize) in /_/src/Avalonia.Layout/Layoutable.cs:line 364
   at Avalonia.Layout.LayoutManager.Measure(ILayoutable control) in /_/src/Avalonia.Layout/LayoutManager.cs:line 287
   at Avalonia.Layout.LayoutManager.ExecuteInitialLayoutPass() in /_/src/Avalonia.Layout/LayoutManager.cs:line 174
   at Avalonia.Controls.Window.ShowCore(Window parent) in /_/src/Avalonia.Controls/Window.cs:line 688
   at Avalonia.Controls.Window.Show() in /_/src/Avalonia.Controls/Window.cs:line 626
   at Avalonia.Controls.ApplicationLifetimes.ClassicDesktopStyleApplicationLifetime.ShowMainWindow() in /_/src/Avalonia.Controls/ApplicationLifetimes/ClassicDesktopStyleApplicationLifetime.cs:line 141
   at Avalonia.Controls.ApplicationLifetimes.ClassicDesktopStyleApplicationLifetime.Start(String[] args) in /_/src/Avalonia.Controls/ApplicationLifetimes/ClassicDesktopStyleApplicationLifetime.cs:line 130
   at Avalonia.ClassicDesktopStyleApplicationLifetimeExtensions.StartWithClassicDesktopLifetime[T](T builder, String[] args, ShutdownMode shutdownMode) in /_/src/Avalonia.Controls/ApplicationLifetimes/ClassicDesktopStyleApplicationLifetime.cs:line 187
   at AvaloniaWebView.Sample.Program.Main(String[] args) in /Users/andreas/Projects/AvaloniaWebView/samples/AvaloniaWebView.Sample/Program.cs:line 15