Hi @carsten_h,
This is related to some changes that have happened in the past on the AppDaemon addon.
AppDaemon addon used to get configuration from /homeassistant/appdaemon, but now it gets it from /addon_configs/a0d7b954_appdaemon.
You would need to modify the appdaemon.yaml file from the addon folder to add the app_dir attribute.
I recommend you checking the installation page and go through it for your changes:
https://xaviml.github.io/controllerx/start/installation/
With these changes, it will get ControllerX from the /homeassistant/appdaemon folder which is where HACS installs it to.
Regards,