bt_gatt: Unable to register handle 0x0016 on ncs v2.4.2

Question

I use nRF5340 to test Nordic UART Service. But RTT Viewer the following error messages. What is meaning and how to fix it? 
 <err> bt_gatt: Unable to register handle 0x0016

Vidar Berg · Accepted Answer

The function smp_bt_register() runs automatically on startup when CONFIG_MCUMGR_TRANSPORT_BT is enabled. Therefore, you should remove your call to this function in main().

bt_gatt: Unable to register handle 0x0016 on ncs v2.4.2

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