Failed execute UpdateLocker process.

[LionelXN]

In Uno GTK, there is a probability that the ObservableCollection object will trigger this error during Clear(): Failed execute UpdateLocker process. ex: System. InvalidOperationException: Base scope should never be popped. How can I fix this?

[jeromelaban]

Thanks for the report. If you can provide a repro, it would be ideal. Also, can you provide the full stack trace of the exception?

[LionelXN]

 [21:57:09,915](1)-E ; Failed execute UpdateLocker process.ex:System.InvalidOperationException: Base scope should never be popped.
   at Uno.UI.ResourceResolver.PopScope() in C:\a\1\s\src\Uno.UI\UI\Xaml\ResourceResolver.cs:line 397
   at Windows.UI.Xaml.FrameworkTemplate.LoadContent() in C:\a\1\s\src\Uno.UI\UI\Xaml\FrameworkTemplate.cs:line 106
   at Windows.UI.Xaml.FrameworkTemplatePool.DequeueTemplate(FrameworkTemplate template) in C:\a\1\s\src\Uno.UI\UI\Xaml\FrameworkTemplatePool.cs:line 191
   at Windows.UI.Xaml.Controls.ContentPresenter.UpdateContentTemplateRoot() in C:\a\1\s\src\Uno.UI\UI\Xaml\Controls\ContentPresenter\ContentPresenter.cs:line 886
   at Windows.UI.Xaml.DependencyObjectStore.InvokeCallbacks(DependencyObject actualInstanceAlias, DependencyProperty property, DependencyPropertyDetails propertyDetails, Object previousValue, DependencyPropertyValuePrecedences previousPrecedence, Object newValue, DependencyPropertyValuePrecedences newPrecedence, Boolean bypassesPropagation) in C:\a\1\s\src\Uno.UI\UI\Xaml\DependencyObjectStore.cs:line 1824
   at Windows.UI.Xaml.DependencyObjectStore.RaiseCallbacks(DependencyObject actualInstanceAlias, DependencyPropertyDetails propertyDetails, Object previousValue, DependencyPropertyValuePrecedences previousPrecedence, Object newValue, DependencyPropertyValuePrecedences newPrecedence) in C:\a\1\s\src\Uno.UI\UI\Xaml\DependencyObjectStore.cs:line 1755
   at Windows.UI.Xaml.DependencyObjectStore.InnerSetValue(DependencyProperty property, Object value, DependencyPropertyValuePrecedences precedence, DependencyPropertyDetails propertyDetails, Boolean isPersistentResourceBinding) in C:\a\1\s\src\Uno.UI\UI\Xaml\DependencyObjectStore.cs:line 515
   at Windows.UI.Xaml.Controls.ItemsControl.PrepareContainerForItemOverride(DependencyObject element, Object item) in C:\a\1\s\src\Uno.UI\UI\Xaml\Controls\ItemsControl\ItemsControl.cs:line 1231
   at Windows.UI.Xaml.Controls.ItemsControl.PrepareContainerForIndex(DependencyObject container, Int32 index) in C:\a\1\s\src\Uno.UI\UI\Xaml\Controls\ItemsControl\ItemsControl.cs:line 1274
   at Windows.UI.Xaml.Controls.ItemsControl.UpdateItems(NotifyCollectionChangedEventArgs args) in C:\a\1\s\src\Uno.UI\UI\Xaml\Controls\ItemsControl\ItemsControl.cs:line 1036
   at Windows.UI.Xaml.Controls.ItemsControl.OnItemsSourceSingleCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args, Int32 section) in C:\a\1\s\src\Uno.UI\UI\Xaml\Controls\ItemsControl\ItemsControl.cs:line 905
   at Uno.UI.Extensions.VectorChangedEventHandlerExtensions.TryRaise(ValueTuple`2 handlers, IObservableVector`1 owner, IVectorChangedEventArgs args) in C:\a\1\s\src\Uno.UI\Extensions\VectorChangedEventHandlerExtensions.cs:line 11
   at System.Collections.ObjectModel.ObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)

[LionelXN]

And i used Rev.4.5.14 of Uno

[jeromelaban]

Thanks. Is the issue still present in uno 4.8 or 4.9-dev builds? Also, could you provide the full stack trace?