Which pins are you using?
P9_14
P9_22
P8_12
and P8_14 work just fine for me

On Sunday, March 2, 2014 2:24:31 PM UTC-5, ghostma...@gmail.com wrote:
>
> very 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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