System.AggregateException : One or more errors occurred. (Assert.Null() Failure: Value is not null Expected: null Actual: Prism.Navigation.NavigationException: An error occurred while resolving the page. This is most likely the result of invalid XAML or other type initialization exception ---> Prism.Mvvm.ViewCreationException: Unable to create Page 'MainPage'. ---> Prism.Regions.Behaviors.RegionCreationException: An exception occurred while creating a region with name 'Demo'. The exception was: System.Exception: The view must inherit from VisualElement. at Prism.Regions.Region.InnerAdd(Object view, String viewName, IRegionManager scopedRegionManager) in D:\a\Prism\Prism\src\Maui\Prism.Maui\Regions\Region.cs:line 268 at Prism.Regions.Region.Add(Object view, String viewName, Boolean createRegionManagerScope) in D:\a\Prism\Prism\src\Maui\Prism.Maui\Regions\Region.cs:line 260 at Prism.Regions.Region.Add(Object view) in D:\a\Prism\Prism\src\Maui\Prism.Maui\Regions\Region.cs:line 231 at Prism.Regions.Behaviors.AutoPopulateRegionBehavior.StartPopulatingContent() in D:\a\Prism\Prism\src\Maui\Prism.Maui\Regions\Behaviors\AutoPopulateRegionBehavior.cs:line 54 at Prism.Regions.Behaviors.AutoPopulateRegionBehavior.OnAttach() in D:\a\Prism\Prism\src\Maui\Prism.Maui\Regions\Behaviors\AutoPopulateRegionBehavior.cs:line 39 at Prism.Regions.RegionBehavior.Attach() in D:\a\Prism\Prism\src\Prism.Core\Regions\RegionBehavior.cs:line 49 at Prism.Regions.RegionBehaviorCollection.Add(String key, IRegionBehavior regionBehavior) in D:\a\Prism\Prism\src\Prism.Core\Regions\RegionBehaviorCollection.cs:line 54 at Prism.Regions.Adapters.RegionAdapterBase`1.AttachDefaultBehaviors(IRegion region, T regionTarget) in D:\a\Prism\Prism\src\Maui\Prism.Maui\Regions\Adapters\RegionAdapterBase.cs:line 102 at Prism.Regions.Adapters.RegionAdapterBase`1.Initialize(T regionTarget, String regionName) in D:\a\Prism\Prism\src\Maui\Prism.Maui\Regions\Adapters\RegionAdapterBase.cs:line 53 at Prism.Regions.Adapters.RegionAdapterBase`1.Prism.Regions.Adapters.IRegionAdapter.Initialize(VisualElement regionTarget, String regionName) in D:\a\Prism\Prism\src\Maui\Prism.Maui\Regions\Adapters\RegionAdapterBase.cs:line 69 at Prism.Regions.Behaviors.DelayedRegionCreationBehavior.CreateRegion(VisualElement targetElement, String regionName) in D:\a\Prism\Prism\src\Maui\Prism.Maui\Regions\Behaviors\DelayedRegionCreationBehavior.cs:line 136. ---> System.Exception: The view must inherit from VisualElement. at Prism.Regions.Region.InnerAdd(Object view, String viewName, IRegionManager scopedRegionManager) in D:\a\Prism\Prism\src\Maui\Prism.Maui\Regions\Region.cs:line 268 at Prism.Regions.Region.Add(Object view, String viewName, Boolean createRegionManagerScope) in D:\a\Prism\Prism\src\Maui\Prism.Maui\Regions\Region.cs:line 260 at Prism.Regions.Region.Add(Object view) in D:\a\Prism\Prism\src\Maui\Prism.Maui\Regions\Region.cs:line 231 at Prism.Regions.Behaviors.AutoPopulateRegionBehavior.StartPopulatingContent() in D:\a\Prism\Prism\src\Maui\Prism.Maui\Regions\Behaviors\AutoPopulateRegionBehavior.cs:line 54 at Prism.Regions.Behaviors.AutoPopulateRegionBehavior.OnAttach() in D:\a\Prism\Prism\src\Maui\Prism.Maui\Regions\Behaviors\AutoPopulateRegionBehavior.cs:line 39 at Prism.Regions.RegionBehavior.Attach() in D:\a\Prism\Prism\src\Prism.Core\Regions\RegionBehavior.cs:line 49 at Prism.Regions.RegionBehaviorCollection.Add(String key, IRegionBehavior regionBehavior) in D:\a\Prism\Prism\src\Prism.Core\Regions\RegionBehaviorCollection.cs:line 54 at Prism.Regions.Adapters.RegionAdapterBase`1.AttachDefaultBehaviors(IRegion region, T regionTarget) in D:\a\Prism\Prism\src\Maui\Prism.Maui\Regions\Adapters\RegionAdapterBase.cs:line 102 at Prism.Regions.Adapters.RegionAdapterBase`1.Initialize(T regionTarget, String regionName) in D:\a\Prism\Prism\src\Maui\Prism.Maui\Regions\Adapters\RegionAdapterBase.cs:line 53 at Prism.Regions.Adapters.RegionAdapterBase`1.Prism.Regions.Adapters.IRegionAdapter.Initialize(VisualE

Process completed with exit code 1.

Converting null literal or possible null value to non-nullable type.

Possible null reference argument for parameter 'parameter' in 'Task AsyncDelegateCommand<T>.Execute(T parameter, CancellationToken cancellationToken = default(CancellationToken))'.

Converting null literal or possible null value to non-nullable type.

Possible null reference argument for parameter 'parameter' in 'Task AsyncDelegateCommand<T>.Execute(T parameter, CancellationToken cancellationToken = default(CancellationToken))'.

Missing XML comment for publicly visible type or member 'IRegistryAware'

Missing XML comment for publicly visible type or member 'IRegistryAware.Registry'

Missing XML comment for publicly visible type or member 'MulticastExceptionHandler.Register<TException>(MulticastDelegate)'

Missing XML comment for publicly visible type or member 'MulticastExceptionHandler.HandleAsync(Exception, object?)'

Missing XML comment for publicly visible type or member 'ViewCreationException'