Issues creating an empty surface with dynamo

Civil3D
4

Hi
Try



import clr

clr.AddReference('AcDbMgd')
clr.AddReference('AeccDbMgd')
clr.AddReference('AutoCADNodes')
clr.AddReference('Civil3DNodes')   

from Autodesk.AutoCAD.ApplicationServices import *
from Autodesk.AutoCAD.DatabaseServices import *
from Autodesk.Civil.ApplicationServices import *
from Autodesk.Civil.DatabaseServices import *
import Autodesk.AutoCAD.DynamoNodes as DA
import Autodesk.Civil.DynamoNodes as DC

adoc = Application.DocumentManager.MdiActiveDocument
cdoc = CivilApplication.ActiveDocument

def create_tin():

    
    global adoc
    global cdoc

    with adoc.LockDocument():
        with adoc.Database as db:    
            with db.TransactionManager.StartTransaction() as t:
                surfId = TinSurface.Create(db, "test")
                surf = t.GetObject(surfId, OpenMode.ForWrite)

                t.Commit()
                pass
    return surf

OUT = create_tin()