BLE NUS not compatible in v1.6 for nrf52840 dongle

I tried using the ble nus with throughput using the example from https://github.com/LeoHJX/ncsExp/tree/master/app/ble/throughput_nus. However i kept getting an error on the uart callback set function. I tried the ble nus on v1.5.1 and it works but the throughput example only works on v1.6. What are the difference in the NUS setup in v1.5.1 and v1.6

Related