Not much to go with. Which RPi board version are you running it on? Did you google the error message? Please check the grafana log file for hopefully more info…
@Jusufs I believe nobody answered because we are not sure either. Grafana doesn’t support it so you’ll need to hack something yourself. Did you make any progress?
@waitz_sebastian I never went this way, asking influxdb for values. You may need to play around a bit. I would be interested in the results. From what you’ve posted currently your “cheapest_sprit” is not a basic datatype like String or Float. Use the SmartHome Designer to find out about methods you can on a QueryablePersistenceServiceDelegate object.