Workflow activities disappeared

Hello,

I got a strange issue with a flowchart - out of a sudden, all the activities in a workflow I was working on, disappeared, along with the error message from the screenshot.

If I invoke this flowchart somewhere else, it still keeps its functionality, but I cannot edit anything in it (as the activities are hidden).

Any solution to this, guys? :slight_smile:

The detailed error message is below:

An internal error has occurred. It is recommended to restart UiPath Studio.

Error: System.ArgumentNullException: Value cannot be null.
Parameter name: key

  • at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)*
  • at System.Activities.Core.Presentation.FlowchartDesigner.SetFlowElementModelItem(UIElement view, ModelItem model)*
  • at System.Activities.Core.Presentation.FlowchartDesigner.ProcessAndGetModelView(ModelItem model)*
  • at System.Activities.Core.Presentation.FlowchartDesigner.AddFlowElementsToDesigner(IList`1 flowElementMICollection, Boolean addConnectorAfterLoaded)*
  • at System.Activities.Core.Presentation.FlowchartDesigner.PopulateFlowchartChildren()*
  • at System.Activities.Core.Presentation.FlowchartDesigner.OnFreeFormPanelLoaded(Object sender, RoutedEventArgs eventArgs)*
  • at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)*
  • at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)*
  • at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)*
  • at System.Windows.UIElement.RaiseEvent(RoutedEventArgs e)*
  • at System.Windows.BroadcastEventHelper.BroadcastEvent(DependencyObject root, RoutedEvent routedEvent)*
  • at System.Windows.BroadcastEventHelper.BroadcastLoadedEvent(Object root)*
  • at MS.Internal.LoadedOrUnloadedOperation.DoWork()*
  • at System.Windows.Media.MediaContext.FireLoadedPendingCallbacks()*
  • at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()*
  • at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget)*
  • at System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget)*
  • at System.Windows.Media.MediaContext.Resize(ICompositionTarget resizedCompositionTarget)*
  • at System.Windows.Interop.HwndTarget.OnResize()*
  • at System.Windows.Interop.HwndTarget.HandleMessage(WindowMessage msg, IntPtr wparam, IntPtr lparam)*
  • at System.Windows.Interop.HwndSource.HwndTargetFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)*
  • at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)*
  • at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)*
  • 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), HResult -2147467261*

@alin.mihalea,

Restart the UiPath Studio, clean the temp files from run command using - %temp%
Still facing same issue, restart your machine and check again.

I see this sometimes on mine. I would click retry later. Copy the file and place somewhere just in case. Then I would save, then restart. It’s never destroyed my data before so you should be good.

Happy Botting!

You follow Botmonkey

Thank you for the help.
Unfortunately, none of these solved the issue…

kindly delete the project.json file and then open your .xaml file
Cheers @alin.mihalea