Civil Connection Not Working

Hi !
I have 2021 versiosn of Civil 3D and Revit, so I installed Civil Connection 2021 an Python for Civil 3D as described on the guide.
Both Revit and Civil 3D have the same units and also the Civil 3D file is open and saved but the civil application node is not working

Hi @fzbenouaziz

Could you expand the error messages. What does it says?

This is the error message

Avertissement:CivilApplication…ctor l’opération a échoué.
Méthode introuvable : ‘Void Autodesk.Revit.DB.FormatOptions…ctor(Autodesk.Revit.DB.DisplayUnitType)’.

did anyone got the answer for this? having the same issue. it shows the warning below
*Warning: CivilApplication…ctor operation failed. *
Object reference not set to an instance of an object.