Zephyr PM module function not found

Hi 

I try to run the example (blog_lowpower) from  https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/optimizing-power-on-nrf53-designs 

I got error of 'PM_DEVICE_STATE_ACTIVE' undeclared, and warning of implicit declaration of function 'pm_device_state_set' 

Even though it is a warning, I cannot found pm_device_state_set in <pm/pm.h> . I think it should be an error instead of a warning.

Note: I am running on ncs 2.02

Please help

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