Every time I try to use certain PWM pins on the BeagleBone Black I get this 
error for most of the pins (from the ones shown in yellow 
here: http://beagleboard.org/static/images/cape-headers-pwm.png)
I am using Ubuntu on my BeagleBone Black.
"RuntimeError: You must start() the PWM channel first"

Any reason why? What's the max number of same-frequency PWM channels I can 
have ongoing at any one time?

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