Config flow could not be loaded: {"message":"Invalid handler specified"}

[riesi77]

Hi,
research on how to bring values of netzooe into Home Assistant brought me to this page. However, there is not much documentation and I'm not even sure if it fits my purpose.
I tried to install (custom repo using HACS, then adding the integration), but when trying to add the integration, I am getting the following error:

Config flow could not be loaded: {"message":"Invalid handler specified"}

I guess there is some additional config needed which I don't know about.

What would I like to achieve? I am delivering my PV energy to a EEG (Erneuebare Energiegemeinschaft), the rest amout that is not needed in the EEG is delivered to OEMAG.
In the NetzOOE Portal, I can see "EG - errechnerer Überschuss" and "Wirkenergiewerte lt. Messung". The first one is the amount that is not needed in the EEG and by that the number I am interested in.

Would this be possible with your integration? If yes, what is needed to complete my installation?

Thanks.