Hi I changed to Dynamo studio 2017 and autodesk Autocad 2017 and it works. I was not the Dynamo 2019 that was the problem cause it could read the old Autocad files but it could not handle autocadfiles dwg. from autocad 2019
This is because the dog standard changed in 2019. You’ll find you also have issues importing a 2019 dwg into a 2017 Revit version unless you save down the file format.