Apex charts example won't load

[Jleagle]

When i copy and paste the apex charts code from the readme, it fails to load.

type: custom:apexcharts-card
graph_span: 2d
span:
  start: hour
  offset: '-5h'
now:
  show: true
  label: now
series:
  - entity: sensor.lee_on_solent_tide
    extend_to_end: false
    unit: m
    data_generator: |
      return entity.attributes.predictions.map((event) => {
        return [moment.utc(event[0]).local(), event[1]];
      });