[Python] GPIO pin cleanup

I have used python for a while now, however, I am new to using a Raspberry Pi and things such as GPIO pins. I recently bought a Freenove Ultrasonic starter kit to help me learn. They have a tutorial included that I am following. In the program I keep getting this error message:

lgpio.error 'gpio busy'


I have tried loads of things. I know it could be a few things: In a previous project I didn't cleanup the GPIO pins properly or I exported the pins and didn't reverse it.

I have tried numerous commands and script to cleanup the code but it wont work. I also rebooted the Raspberry Pi5 a few times. Here is the code I used for my project:

from gpiozero import LED, Button
import time


led = LED(17) # define LED pin according to BCM Numbering
button = Button(18) # define Button pin according to BCM Numbering


def onButtonPressed():
# When button is pressed, this function will be executed
led.toggle()

if led.is_lit:
print("Led turned on >>>")
else:
print("Led turned off <<<")


def loop():
# Button detect
button.when_pressed = onButtonPressed
while True:
time.sleep(1)


def destroy():
led.close()
button.close()


if __name__ == '__main__':
# Program entrance

print('Program is starting...')
try:
loop()

except KeyboardInterrupt:
# Press ctrl-c to end the program.
destroy()
print("Ending program")

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