[beagleboard] Beaglebone AI - read analog input with python

[davavru]

Hello, i have a Beaglebone AI, i need read analog input with python code, 
example:

import Adafruit_BBIO.ADC as ADC
from time import sleep

ADC.setup()

analogPin = "P9_33"

while(1):
       potVal = ADC.read(analogPin)
       potVolt = potVal*1.8
       print ("The Potentiometer Voltage is: {}".format(potVolt))
       sleep(0.5)

but, this code generated error:

debian@beaglebone:~$ sudo python3 test_bbai_ai.py
Traceback (most recent call last):
  File "test_bbai_ai.py", line 4, in <module>
    ADC.setup()
RuntimeError: Unable to setup ADC system. Possible causes are:
  - A cape with a conflicting pin mapping is loaded
  - A device tree object is loaded that uses the same name for a fragment: 
helper

Please, help me, thank you.

PD. BeagleBoard.org Debian Buster IoT TIDL Image 2020-04-06

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