Issue Description

Please fill in the following information to help us reproduce the issue:

What did you do?

I opened Dynamo 2.5 in Revit application, after running several Dynamo Revit sample scripts, and I would like to create a new Dynamo file, the crash just happened. Please notice there is no open dynamo files.

What did you expect to see?

No crash when creating a new dynamo file.

What did you see instead?

(Fill in here)

What packages or external references (if any) were used?

No package has been downloaded.

Stack Trace

(From the Dynamo crash window select 'Details' -> 'Copy' and paste here)

Starting a transaction from an external application running outside of API context is not allowed.

at Autodesk.Revit.DB.Transaction.Start()
at RevitServices.Transactions.TransactionWrapper.StartTransaction(Document document)
at RevitServices.Transactions.TransactionManager.EnsureInTransaction(Document document)
at RevitServices.Persistence.DocumentManager.DeleteElement(ElementUUID element)
at ProtoFFI.CLRObjectMarshaler.core_Dispose(RuntimeCore sender)
at ProtoCore.RuntimeCore.DisposeDelegate.Invoke(RuntimeCore sender)
at ProtoCore.RuntimeCore.OnDispose()
at ProtoScript.Runners.LiveRunner.Dispose(Boolean disposing)
at Dynamo.Engine.LiveRunnerServices.Dispose()
at Dynamo.Engine.EngineController.Dispose()
at Dynamo.Models.DynamoModel.ResetEngineInternal()
at Dynamo.Models.DynamoModel.ResetEngine(Boolean markNodesAsDirty)
at Dynamo.ViewModels.DynamoViewModel.MakeNewHomeWorkspace(Object parameter)
at MS.Internal.Commands.CommandHelpers.CriticalExecuteCommandSource(ICommandSource commandSource, Boolean userInitiated)
at System.Windows.Controls.Primitives.ButtonBase.OnClick()
at System.Windows.Controls.Button.OnClick()
at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e)
at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent)
at System.Windows.UIElement.OnMouseUpThunk(Object sender, MouseButtonEventArgs e)
at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
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.RaiseTrustedEvent(RoutedEventArgs args)
at System.Windows.Input.InputManager.ProcessStagingArea()
at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at System.Windows.Interop.HwndSource.InputFilterMessage(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)

OS: Microsoft Windows NT 10.0.15063.0
CLR: 4.0.30319.42000
Dynamo: 2.5.0.7186