Helper Error - required key not provided @ data['value']. Got None

I would like to record the current brightness of a light to a helper, and then reduce that number by some amount, and then set the lights to that level.

I am trying to run an action " Input number ‘Set’"

The YAML I have is

action: input_number.set_value
metadata: {}
data: {}
  value: {{state_attr('light.living_room_ceiling_fan_light', 'brightness')}}
target:
  entity_id: input_number.living_room_light_brightness

I get the error “required key not provided @ data[‘value’]. Got None”

I feel like it worked once, and I don’t know what I changed but it didn’t work again after I tried to go to the next step I had in mind.

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