Homegear4homeassistant: Error: Server could not start listening on port 2004: Cannot assign requested address

Third party integrations
1

I’m trying to move from fhem with Homematic to Home Assistant.
I have successfully installed homegear4homeassistant.
I was also able to connect homegear to my HM-LGW and register a blind actuator.

But I’ not able to connect Home Assistant to homegear.
I added

#Homematic (Homegear)
homematic:
  interfaces:
    wireless:
      host: localhost
      resolvenames: metadata
      port: 2001

to /config/configuration.yaml.

But now I cannot access http://homeassistant:2001/admin/ anymore and I see the following errors in the log file:

12/13/20 13:17:05.788 UPnP Server: Info: UPnP server: Binding to address: 172.30.33.1
12/13/20 13:17:09.692 HM-LGW "hm-lgw": Info: Firmware version: 1.4.1
12/13/20 13:17:09.718 HM-LGW "hm-lgw": Info: Init queue completed. Sending peers...
12/13/20 13:17:09.753 HM-LGW "hm-lgw": Info: Peer sending completed.
12/13/20 13:17:10.757 RPC Server (Port 2004): Error: Server could not start listening on port 2004: Cannot assign requested address
12/13/20 13:17:15.760 RPC Server (Port 2004): Error: Server could not start listening on port 2004: Cannot assign requested address

Does anybody has an idea what I’m doing wrong?

Edit: I just found this log entry but it seems to be related to the HomeMatic CCU plug-in which I now disabled. But I still cannot reach http://homeassistant:2001/admin/

20-12-13 12:31:11 ERROR (MainThread) [supervisor.addons.addon] Add-on core_homematic has invalid options: Missing option rf in root. Got {'rf_enable': False, 'wired_enable': False, 'hmip_enable': False}
20-12-13 12:31:11 WARNING (MainThread) [supervisor.addons] Can't start Add-on core_homematic

Thanks.

Peter