custom_card_apexcharts not working

[base2006]

After I installed the custom_card_apexcharts I'm getting this error (see screenshot) and I don't know how to fix it. Am I missing something?

RomRider/apexcharts-card has been installed.

Config below

  - type: "custom:button-card"
    template: "custom_card_apexcharts"
    variables:
      chart_type: "line"
      graph_span: "1h"
      entity_1:
        entity_id: "sensor.p1_meter_total_power_export"
        name: "Export"
        color: "blue"
        max_value: 4

[wilbiev]

It looks like your sensor entity doesn't have a icon attribute. Maybe your sensor is based on a template.