I want to know the meaning of the error when operating the dfu

[mani221]

We are testing the combination of hrs example and the code in the butonless example.
When I tried dfu after putting the code together, this error occurred.
What does this error mean?

[Einar Thorsrud]

Hi,

The specific UUID(0x8EC90001F3154F609FB8838830DAEA50) is the DFU Control Point. As this is missing, the DFU service is probably not (properly) initialized.