Failed to load language IronPython 2.7.9

[jmosh6]

Dynamo version

Dynamo Core 2.6.2.15705
Dynamo Revit 2.6.2.15772

Operating system

Windows 10

What did you do?

Opened Dynamo player and ran a script. The script did not run. When opened in dynamo, there was an error with a python node. The error was as follows:

Warning: IronPythonEvaluator.EvaluateIronPythonScript operation failed. Failed to load language IronPython 2.7.9': Object reference not set to an instance of an object.

This is happening on all the scripts on this particular computer. I am responsible for the automation in our VDC department. I have been starting to see this error pop up on a few different computers.

What did you expect to see?

I expected the script to be able to run.

What did you see instead?

I saw the error:

Warning: IronPythonEvaluator.EvaluateIronPythonScript operation failed. Failed to load language IronPython 2.7.9': Object reference not set to an instance of an object.

[github-actions]

Thank you for submitting the issue to us. We are sorry to see you get stuck with your workflow. While waiting for our team member to respond, please feel free to browse our forum at https://forum.dynamobim.com/ for more Dynamo related information.

[avidit]

@jmosh6 Can you please provide the list of packages installed?

[jmosh6]

@avidit Yes, attached below you will see an image of the packages installed. Thanks!

[jmosh6]

I had it happen again. Here is the error report for reference.
Failed to load language 'IronPython 2.7.9': Object reference not set to an instance of an object.

at Microsoft.Scripting.Runtime.LanguageConfiguration.LoadLanguageContext(ScriptDomainManager domainManager, Boolean& alreadyLoaded)
at Microsoft.Scripting.Runtime.DlrConfiguration.LoadLanguageContext(ScriptDomainManager manager, LanguageConfiguration config)
at Microsoft.Scripting.Runtime.DlrConfiguration.TryLoadLanguage(ScriptDomainManager manager, AssemblyQualifiedTypeName providerName, LanguageContext& language)
at Microsoft.Scripting.Runtime.ScriptDomainManager.GetLanguageByTypeName(String providerAssemblyQualifiedTypeName)
at Microsoft.Scripting.Hosting.ScriptRuntime.GetEngineByTypeName(String assemblyQualifiedTypeName)
at Dynamo.Python.IronPythonCompletionProvider..ctor(String dynamoCoreDir)
at PythonNodeModelsWpf.ScriptEditorWindow..ctor(DynamoViewModel dynamoViewModel, PythonNode nodeModel, NodeView nodeView, WindowRect& windowRect)
at PythonNodeModelsWpf.PythonNodeViewCustomization.EditScriptContent()
at PythonNodeModelsWpf.PythonNodeViewCustomization.view_MouseDown(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)

[mjkkirschner]

Try disabling all Revit addins on this machine.