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LP-EM-CC2745R10-Q1: testing channel sounding example in above SDK, but encounter error

Part Number: LP-EM-CC2745R10-Q1

Tool/software:

Hi, 

I am trying out channel sounding example in latest SDK . \simplelink_lowpower_f3_sdk_9_11_00_18

I have loaded both the car node and key node code into 2 boards seperately, and start running the Python scripts for distance measurement. 

the last instruction is 

python ble_device_car_node_with_distance.py

and i get this error

(.venv) C:\ti\simplelink_lowpower_f3_sdk_9_11_00_18\tools\ble\ble_agent\examples>python ble_device_car_node_with_distance.py
Traceback (most recent call last):
File "C:\ti\simplelink_lowpower_f3_sdk_9_11_00_18\tools\ble\ble_agent\examples\ble_device_car_node_with_distance.py", line 12, in <module>
from ble_device import (
ModuleNotFoundError: No module named 'ble_device'

did i do something wrong here?
can you advise ? thanks