LFCLK source selection

Hi,

I am using nrf52832, in the ble_app_uart_c example, i want to use rc source as a lfclk,

i changed the following parameters in the sdk_config.h:

NRFX_CLOCK_CONFIG_LF_SRC=RC

CLOCK_CONFIG_LF_SRC=RC

NRF_SDH_CLOCK_LF_SRC=NRF_CLOCK_LF_SRC_RC

but i am getting NRF_ERROR_INVALID_PARAM error from the nrf_sdh_enable_request() function

What is the point.