If this is the first time you've booted your BeagleBone Black, or if you've just flashed a new image, it's best to start by ensuring your installed software packages are all up to date. You can do so using Debian's apt package manager:

# apt-get update && apt-get upgrade

This process might take a few minutes.

Next, use the pip Python package manager to update to the latest versions of the PyBBIO and Adafruit_BBIO libraries:

# pip install --upgrade PyBBIO Adafruit_BBIO

As both libraries are currently in active development, it's worth running this command from time to time to make sure you have all the latest features.