Beem Energy Solar Power

[Lennart-Live (Lennart)]

Hi,
I want to monitor my Beem Energy Solar panels in HA.
Run into this artical:

Beem Energy Solar Power Configuration

Hi, I just want to share with you my configuration for getting the generated power from my Beem Solar panels. Since there is no local API, alas, I configured a sensor that get the generated power through their (unexposed) remote API. template: - sensor: - name: post_data state: '{"month":{{now().strftime("%m").lstrip("0")}},"year":{{now().strftime("%Y")}}}' sensor: - platform: command_line command: "curl -X POST -H --location 'https://api-x.beem.energy/beemapp/box/summar…

But when i try to create a template with this code i get this error: UndefinedError: ‘value_json’ is undefined !
Is there somebody who runs in the same error and has a fix, or is there somebody who has a working configuration and can help me a bit?

Thank you very much.
Lennart