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Why does my outputs from my RaspberryPi3 not work?

on

unfortunately my RaspberryPi 3 Output Gpio´s doesn't work. If I setup them to an input they work but if I want to make an output it happens nothing not either a warning comes. When I put the LED at 3,3V and GND it light up. I hope you can help me :)

import RPi.GPIO as GPIO
import time

GPIO.setwarnings(False)

GPIO.setmode(GPIO.BOARD)
GPIO.setup(40, GPIO.OUT)

for i in range(3):
    GPIO.output(40, GPIO.HIGH)
    time.sleep(1)
    GPIO.output(40, GPIO.LOW)
    time.sleep(1)

GPIO.cleanup()

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