Mesh device provision failed

HI,Therd:

    I used the mesh sdk 5.0.0(BLE SDK 17.0.2), and run the example light_switch_server_nrf52832_xxAA_s132_7_2_0.emProject. when i use the nRF Mesh app on the phone to proviosning the device .The device can be found ,but when  IDENTIFY in the app ,it failed with the error info: "Unicast address is already in use." , why this problem?

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