Proxmox dashboard isn't working

Hello out there,

i tried to monitor my Proxmox host with Grafana and Influxdb. I configured the external metric server on my proxmox with http. I followed this tutorial:

The dashboard which is used in the tutorial works fine. But now I want to use this dashboard: Proxmox | Grafana Labs.

When I try to add the dashboard to Grafana I get this result:

and e. g. these errors:

I hope you can help me.
Best regards