NRF_TWI1->POWER no number named Power in NRF_TWI_Type

I'm tring to run my first twi program using nrf52. but I got complilation error no number named Power in NRF_TWI_Type

it's strange because NRF_TWI1 called from twi_master_write for example doent have power attribute. I looked in the NRF_TWI_Type in rnf52.h file and couldnt find the attribute POWER !!

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