Failed to connect to target.(nrf52832 dk debug out)

hi devzone

I tried connecting nrf52832 dk board - debug out to bluetooth module nrf52832.

I refer to this picture.

at fisrt, it was successfully to connect dk board to bluetooth module (using debug out of dk board)

I can debug the example(blinky) file into bluetooth module.

but after I click target - erase all, I can't debug at all.

other nrf52 dk boards are fine.

but when I connected like above picture and tried to click target - connect J-link, erro report displayed with message  "Failed to connect to target."

how can I debug to bluetooth module again?

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