[Python] How can I adjust my Cape Manager to not get runtime errors on the BeagleBone Black?

I noticed that I keep getting a "Runtime Error: Problem with Cape Manager" when I run a specific piece of software on my BeagleBone Black.

I have a RGB LED with four wires coming out of it, and they are connected to my BeagleBone Black via resistors and jumper wires. How does my cape manager work and where can I find this information?

Where can I find information on how to change the Cape Manager and why would I need to change the Cape Manager?

The software is listed here:

import Adafruit_BBIO.PWM as PWM
import time

red = "P8_13"
green = "P8_19"
blue = "P9_14"

PWM.start(red, 0)
PWM.start(blue, 0)
PWM.start(green, 0)

def fade(colorA, colorB, ignore_color):
PWM.set_duty_cycle(ignore_color, 100)
for i in range(0, 100):
PWM.set_duty_cycle(colorA, i)
PWM.set_duty_cycle(colorB, 100-i)
time.sleep(0.05)

while True:
fade(red, green, blue)
fade(green, blue, red)
fade(blue, red, green)


Now...

I am running a Python program from Adafruit's website listed under their BeagleBone Black section of their site.

I can change the /boot directory file uEnv.txt and get my software to work, but when I reboot, the system does not arrive to be. It ceases. I cannot boot.

Is there a way to run this software after changing my /boot/uEnv.txt file and what would I need to change?

P.S. I am running a BeagleBoard.org Debian Image 2017-04-16. uname -a on the cmd line states: Linux beaglebone 4.4.61-ti-r98.

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