UndefinedError: 'trigger' is undefined : what did i miss

@myle wrote:

I have this input_select

  kettle_set:
    name: Set Kettle
    options:
      - 'Keepwarm Off :102,0'
      - 'Keepwarm 40c :102,1'
      - 'Keepwarm 50c :102,2'
      - 'Keepwarm 60c :102,3'
      - 'Keepwarm 80c :102,4'
      - 'Keepwarm 90c :102,5'

I have this automation

- id: 'Set the kettle Auto'
  alias: 'Set the kettle Auto'
  description: ''
  trigger:
  - entity_id: input_select.kettle_set
    platform: state
  condition: []
  action:
  - data:
      payload_template: '{% set dta = trigger.to_state.state %}{{dta.split(":")[1]}}'
      topic: bla/bla
    service: mqtt.publish

I want it to run when the state of the input_select is updated

2020-01-28 17:48:57 ERROR (MainThread) [homeassistant.components.automation] Error while executing automation automation.set_the_kettle_auto. Error rendering template for call_service at pos 1: UndefinedError: 'trigger' is undefined

What manual did i miss read ??

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