Pyautocad: error using pyautocad library on windows (python 3.8)

Good moning,

I’m trying using pyautocad library in python 3.8 on windows with the following example code taken from a tutorial:
import pyautocad acad = pyautocad.Autocad() print(acad.doc.Name) from pyautocad import APoint point1 = APoint(100.0,100.0) circle1 = acad.model.AddCircle(point1,100) circle1.Color = 10 print("current layer: " + str(circle1.Layer)) print("current linetype: " + str(circle1.Linetype)) print("current linetype scale: " + str(circle1.LinetypeScale)) print("current line weight: " + str(circle1.Lineweight)) print("current thickness: " + str(circle1.Thickness)) print("current material:" + str(circle1.Material)) circle1.Layer = "circles" circle1.Color = 256 circle2 = acad.model.AddCircle(APoint(200.0,200.0),100) circle3 = acad.model.AddCircle(APoint(300.0,300.0),100) for obj in acad.iter_objects(): print(obj)

But I obtain the following error and I don’t understand how to solve it:
python Traceback (most recent call last): File "", line 6, in <module> print(acad.doc.Name) File "C:\Users\3bMeteo\anaconda3\lib\site-packages\pyautocad\", line 74, in doc return File "C:\Users\3bMeteo\anaconda3\lib\site-packages\pyautocad\", line 63, in app self._app = comtypes.client.GetActiveObject('AutoCAD.Application', dynamic=True) File "C:\Users\3bMeteo\anaconda3\lib\site-packages\comtypes\client\", line 180, in GetActiveObject obj = comtypes.GetActiveObject(clsid, interface=interface) File "C:\Users\3bMeteo\anaconda3\lib\site-packages\comtypes\", line 1245, in GetActiveObject oledll.oleaut32.GetActiveObject(byref(clsid), None, byref(p)) File "_ctypes/callproc.c", line 948, in GetResult OSError: [WinError -2147221021] Operazione non disponibile

Can I ask if someone has a solution?

Thank you in advance

Best Regards