Unable to run the blinky example on a custom board nrf52811

[ibra123]

I am trying to program my custom board nrf52811 by pca10056 using ses, and i was able to flash any example of nrf_SDK, however the LED does not blink. even though i added this code on custom_board.h : 

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// Low frequency clock source to be used by the SoftDevice

#define NRF_CLOCK_LFCLKSRC {.source = NRF_CLOCK_LF_SRC_RC, \

.rc_ctiv = 16, \

.rc_temp_ctiv = 2, \

.xtal_accuracy = NRF_CLOCK_LF_XTAL_ACCURACY_20_PPM}

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// Low frequency clock source to be used by the SoftDevice
#define NRF_CLOCK_LFCLKSRC      {.source        = NRF_CLOCK_LF_SRC_RC,              \
                                 .rc_ctiv       = 16,                               \
                                 .rc_temp_ctiv  = 2,                                \
                                 .xtal_accuracy = NRF_CLOCK_LF_XTAL_ACCURACY_20_PPM}

but still nothing change. Also, I attached the sch of my board. nRF52811.schIn the end, i want to make this board work as a transmitter, but first i cannot get it to blink. i wish i could get help ASAP.