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Hello Community,   I am trying to create a custom layout, when doing so the studio pro throws an error. I have attached the error below.   System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.  ---> System.NullReferenceException: Object reference not set to an instance of an object.    at Mendix.Modeler.Core.View.ToolWindows.PropertiesPropertyChoiceViewModel.CreateListItem(Object value) in Mendix.Modeler.Core.View.CrossPlatform\ToolWindows\Properties\PropertiesPropertyChoiceViewModel.cs:line 50    at System.Linq.Enumerable.SelectArrayIterator`2.MoveNext()    at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)    at System.Collections.ObjectModel.ObservableCollection`1.CreateCopy(IEnumerable`1 collection, String paramName)    at System.Collections.ObjectModel.ObservableCollection`1..ctor(IEnumerable`1 collection)    at Mendix.Modeler.Core.View.ToolWindows.PropertiesPropertyViewModelFactory.CreatePropertyViewModel(PropertyInfoDescriptor propertyDescriptor) in Mendix.Modeler.Core.View.CrossPlatform\ToolWindows\Properties\PropertiesPropertyViewModelFactory.cs:line 11    at Mendix.Modeler.Core.View.ToolWindows.PropertiesViewModel.ConvertToViewModels(ICustomTypeDescriptor selectionObject)+MoveNext() in Mendix.Modeler.Core.View.CrossPlatform\ToolWindows\Properties\PropertiesViewModel.cs:line 199    at System.Collections.Generic.List`1.InsertRange(Int32 index, IEnumerable`1 collection)    at Mendix.Modeler.Core.View.ToolWindows.PropertiesViewModel.UpdateCategories() in Mendix.Modeler.Core.View.CrossPlatform\ToolWindows\Properties\PropertiesViewModel.cs:line 175    at Mendix.Modeler.Core.View.ToolWindows.PropertiesViewModel.set_SelectedElement(Object value) in Mendix.Modeler.Core.View.CrossPlatform\ToolWindows\Properties\PropertiesViewModel.cs:line 88    at Mendix.Modeler.Core.View.ToolWindows.PropertiesViewModel.SetNewEditorSelection(ITabbedEditor newEditor, ITabbedEditor oldEditor) in Mendix.Modeler.Core.View.CrossPlatform\ToolWindows\Properties\PropertiesViewModel.cs:line 145    at Mendix.Modeler.MainWindow.Managers.TabbedEditorManager.RaiseActiveEditorChanged(ITabContent tabContent) in Mendix.Modeler.MainWindow\Managers\TabbedEditorManager.cs:line 198    at Mendix.Modeler.Core.View.Windows.MainWindow.DockControl.OnWindowActivated(Object sender, DockingWindowEventArgs e) in Mendix.Modeler.Core.View.Windows\MainWindow\DockControl.xaml.cs:line 218    --- End of inner exception stack trace ---    at System.RuntimeMethodHandle.InvokeMethod(Object target, Span`1& arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)    at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)    at System.Delegate.DynamicInvokeImpl(Object[] args)    at System.Windows.RoutedEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)    at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)    at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)    at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)    at ActiproSoftware.Windows.Controls.Docking.DockSite.JKF(DockingWindow  )    at System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e)    at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)    at ActiproSoftware.Windows.Controls.Docking.DockSite.OnPropertyChanged(DependencyPropertyChangedEventArgs e)    at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)    at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)    at System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType, Boolean isInternal)    at ActiproSoftware.Internal.Ni.Activate(DockingWindow window, Boolean focus)    at ActiproSoftware.Windows.Controls.Docking.DockingWindow.Activate(Boolean focus)    at ActiproSoftware.Windows.Controls.Docking.DockingWindow.Activate()    at ActiproSoftware.Windows.Controls.Docking.DockingWindow.u0F(DependencyObject  , DependencyPropertyChangedEventArgs  )    at System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e)    at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)    at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)    at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)    at System.Windows.DependencyObject.InvalidateProperty(DependencyProperty dp, Boolean preserveCurrentValue)    at System.Windows.Data.BindingExpression.TransferValue(Object newValue, Boolean isASubPropertyChange)    at MS.Internal.Data.PropertyPathWorker.UpdateSourceValueState(Int32 k, ICollectionView collectionView, Object newValue, Boolean isASubPropertyChange)    at MS.Internal.Data.ClrBindingWorker.OnSourcePropertyChanged(Object o, String propName)    at System.Windows.WeakEventManager.ListenerList`1.DeliverEvent(Object sender, EventArgs e, Type managerType)    at System.Windows.WeakEventManager.DeliverEventToList(Object sender, EventArgs args, ListenerList list)    at System.ComponentModel.PropertyChangedEventManager.OnPropertyChanged(Object sender, PropertyChangedEventArgs args)    at Mendix.Modeler.Core.View.MainWindow.DockableWindowViewModel.set_IsActive(Boolean value) in Mendix.Modeler.Core.View.CrossPlatform\MainWindow\DockableWindowViewModel.cs:line 24    at Mendix.Modeler.Core.View.MainWindow.DockControlViewModel.ActivateTab(IDockableWindowViewModel windowViewModel) in Mendix.Modeler.Core.View.CrossPlatform\MainWindow\DockControlViewModel.cs:line 398    at Mendix.Modeler.Core.View.MainWindow.DockControlViewModel.ActivateTabbedEditor(IDocumentBase document) in Mendix.Modeler.Core.View.CrossPlatform\MainWindow\DockControlViewModel.cs:line 389    at Mendix.Modeler.Core.View.MainWindow.DockControlViewModel.AddTabbedEditor(IDocumentBase document) in Mendix.Modeler.Core.View.CrossPlatform\MainWindow\DockControlViewModel.cs:line 243    at Mendix.Modeler.MainWindow.Managers.TabbedEditorManager.EditDocument(IDocumentBase document) in Mendix.Modeler.MainWindow\Managers\TabbedEditorManager.cs:line 69    at Mendix.Modeler.Core.View.Editors.DocumentViewManager.EditInTabbedEditor(IDocument document, FocusInfo focusInfo) in Mendix.Modeler.Core.View.CrossPlatform\Editors\DocumentViewManager.cs:line 88    at Mendix.Modeler.Core.View.Editors.DocumentViewManager.EditDocument(IDocument document, FocusInfo focusInfo) in Mendix.Modeler.Core.View.CrossPlatform\Editors\DocumentViewManager.cs:line 68    at Mendix.Modeler.Common.DocumentUtil.ObsoleteEdit(IDocument document, FocusInfo focusInfo) in Mendix.Modeler.Core\Common\Model\DocumentUtil.cs:line 15    at Mendix.Modeler.ProjectHandling.View.ExplorerOperations.AddDocument(IFolder container, INamedDocument document) in Mendix.Modeler.ProjectHandling.View\ExplorerOperations.cs:line 347    at Mendix.Modeler.Core.View.ToolWindows.Nodes.ModuleNode.FolderBaseNode.<>c__DisplayClass5_0.<GetAddItems>b__4(INamedDocument d) in Mendix.Modeler.Core.View.CrossPlatform\ToolWindows\ProjectExplorer\Nodes\ModuleNode\FolderBaseNode.cs:line 62    at Mendix.Modeler.Core.View.ToolWindows.Nodes.ModuleNode.FolderBaseNode.<>c__DisplayClass5_2.<GetAddItems>b__3() in Mendix.Modeler.Core.View.CrossPlatform\ToolWindows\ProjectExplorer\Nodes\ModuleNode\FolderBaseNode.cs:line 62    at Mendix.Modeler.Controls.Menus.MenuItemBuilder.<>c__DisplayClass0_0.<CollectMenuItems>b__2(Object s, EventArgs e) in Mendix.Modeler.Controls\Menus\MenuItemBuilder.cs:line 67    at Eto.Forms.Command.OnExecuted(EventArgs e)    at Eto.Forms.Command.Execute()    at Eto.Forms.Command.System.Windows.Input.ICommand.Execute(Object parameter)    at Eto.PropertyStore.CommandWrapper.Command_Execute(Object sender, EventArgs e)    at Eto.Forms.MenuItem.OnClick(EventArgs e)    at Eto.Forms.MenuItem.Callback.OnClick(MenuItem widget, EventArgs e)    at Eto.Wpf.Forms.Menu.MenuItemHandler`3.OnClick()    at Eto.Wpf.Forms.Menu.MenuItemHandler`3.<Initialize>b__1_0(Object sender, RoutedEventArgs e)    at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)    at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)    at System.Windows.Controls.MenuItem.InvokeClickAfterRender(Object arg)    at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)    at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)   Thanks in advance.

asked 2023-03-26

1 answers