Hi @Soso !
Which version or Revit / Orkestra is this ?
Revit2024/2022,Orkestra 1.9.5
Alright ! This sounds like an install issue. Can you please check that you have:
- Orkestra_ExtensionDefinition.xml file in %PROGRAMFILES%\Autodesk\Revit 2022\AddIns\DynamoForRevit\extensions
- Orkestra_ViewExtensionDefinition.xml in %PROGRAMFILES%\Autodesk\Revit 2022\AddIns\DynamoForRevit\viewExtensions