Cannot read properties of undefined (reading 'startsWith')

Configuration Frontend
1

I try cerate sankey chart but get error. Anyone know why?

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image1141×622 42.7 KB

- type: custom:sankey-chart
  show_names: true
  unit_prefix: k
  round: 1
  wide: true
  sections:
    - entities:
        - entity_id: sensor.group_power_total
          children:
            - sensor.group_power_lt_1
            - sensor.group_power_lt_2
            - sensor.group_power_workshop
2

You need to add the children as well.

- type: custom:sankey-chart
  show_names: true
  unit_prefix: k
  round: 1
  wide: true
  sections:
    - entities:
        - entity_id: sensor.group_power_total
          children:
            - sensor.group_power_lt_1
            - sensor.group_power_lt_2
            - sensor.group_power_workshop
    - entities:
        - entity_id: sensor.group_power_lt_1
        - entity_id: sensor.group_power_lt_2
        - entity_id: sensor.group_power_workshop