D-Link Switch - neverneding story

I read a lot about problems with the D-link switch (Firmware V2.24) in this forum but I didn’t found a solution.

I get the Error Message:
2021-03-12 20:27:52 ERROR (MainThread) [homeassistant.setup] Setup failed for sideboard: Integration not found.

My entry in the /config/configuration.yaml:
sideboard:
platform: dlink
host: 192.168.178.26
name: Sideboard
username: Admin
password: 2*****8
use_legacy_protocol: true

I tried it with and without the legacy enry, no success

Any ideas?

Regards
Ivan