Telegram Automation problem

I am trying to use this automation with telegram bot:

- alias: Telegram - Livingroom lights toggle
  initial_state: true
  trigger:
    platform: event
    event_type: telegram_command
    event_data:
      command: /lights
  action:
  - service: light.toggle
    entity_id: light.salotto
  - service: telegram_bot.send_message
    data_template:
      target: '{{ trigger.event.data.user_id }}'
      message: Le luci del Salotto sono {{ states('light.salotto') }}.
  id: 47a8cbb3cf194b6983952fb7355bbf7f

But i always get this error:

Error rendering data template: UndefinedError: 'dict object' has no attribute 'event'

I tried to find something which can help me to trace this but unsuccesfully…
Any hints from you experts?