KNX IOT sample can not work

I am running the demo of "nrf-knx-iot/samples/light_switch_actuator" on my customized board based on NRF52840.

I could burn the light_switch_actuator firmware into this customized board  successfully, and then I followed the guide https://nordicplayground.github.io/nrf-knx-iot/testing_samples/testing_cases/case_1.html to do. But it could not get the expected result, when I pressed the button of light_switch_sensor , the light_switch_actuator logs showed that it could not find resource.

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