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File "./lights005", line 20, in <module>
pwm = Adafruit_PCA9685.PCA9685()
File "build/bdist.linux-armv6l/egg/Adafruit_PCA9685/PCA9685.py", line 74, in __init__
File "build/bdist.linux-armv6l/egg/Adafruit_GPIO/I2C.py", line 63, in get_i2c_device
File "build/bdist.linux-armv6l/egg/Adafruit_GPIO/I2C.py", line 55, in get_default_bus
RuntimeError: Could not determine default I2C bus for platform.
I'm running Raspbian Jessie on an RPi 2B.