I have back-ups of all of my flows in txt format. I had to add the text sample here as a Word file because txt format is not supported here. The text was copied from the Power Automate Desktop editor. Now it won't paste into the editor. The editor has a single comment line to act as a target for the paste operation.
Message = Object reference not set to an instance of an object.
Error = System.NullReferenceException
Full text = System.NullReferenceException: Object reference not set to an instance of an object.
at Microsoft.Flow.RPA.Desktop.Designer.Core.DesignerProgram.ProgramItems.ActionItemModel.GetReferencedFolderAndImages()
at Microsoft.Flow.RPA.Desktop.Designer.Application.DesignerProgram.Functions.Commands.ProgramItemsCommandsHandlers.Import(IEnumerable`1 items, ImageRepositorySymbol imageRepository)
at Microsoft.Flow.RPA.Desktop.Designer.Application.DesignerProgram.Functions.Commands.ProgramItemsCommandsHandlers.<Handle>d__14.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at MediatR.Pipeline.RequestPostProcessorBehavior`2.<Handle>d__2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at MediatR.Pipeline.RequestPreProcessorBehavior`2.<Handle>d__2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Flow.RPA.Desktop.Designer.UI.Behaviors.ProgramItemsCutCopyPasteBehavior.<AddProgramItemsFromSource>d__3.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Flow.RPA.Desktop.Designer.UI.Behaviors.ProgramItemsCutCopyPasteBehavior.<PasteCommandExecuted>d__12.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
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)

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