Dronekit python file is not working

hi guys,
i’m new to ardupilot and i am facing this issue while using dronekit to run the python code.(using python2 version) let me know if u know how to resolve this…

thanks in advance…

python example.py
Start simulator (SITL)
Traceback (most recent call last):
File “\wsl.localhost\Ubuntu\home\shouri\python_scripts\example.py”, line 15, in
from dronekit import connect, VehicleMode, LocationGlobalRelative
File “\wsl.localhost\Ubuntu\home\shouri\python_scripts\dronekit.py”, line 2, in
import dronekit_sitl
ModuleNotFoundError: No module named ‘dronekit_sitl’

Update to ArduCopter 4.2.3 it still supports python2 and it is much much better than ArduCopter 3.6