AttributeError: 'PWM' object has no attribute 'duty_u16'

This error occurs when you try to use the method 'duty_u16' on an object of the class 'PWM', but the 'duty_u16' method is not defined for the 'PWM' class in the library or module you are using.

Possible solution:

Check the documentation of the library or module you are using and see if there is a different method or attribute that you can use to achieve the same result. Alternatively, you can try using a different library or module that provides the 'duty_u16' method for the 'PWM' class.