title: ValueError: The channel sent is invalid on a Raspberry Pi - Controlling GPIO Pin 2 (BOARD) using Python causes Error
body: <p>So I have a tiny little fan connected to pin 6(Ground) and pin 2. I am trying to manually start and stop the fan when needed but I am getting this error when trying:</p>
  
  <p>ValueError: The channel sent is invalid on a Raspberry Pi</p>
  
  <p>Here is my code that I am executing as root. It seems to be working on other pins but not Pin 2</p>
  
  <pre><code>import RPi.GPIO as GPIO
  
  GPIO.setmode(GPIO.BOARD)
  
  GPIO.setup(2, GPIO.OUT, pull_up_down=GPIO.PUD_UP)
  </code></pre>
  
  <p>I am not sure how to access this pin. Is there something I am doing wrong?</p>