Automation Message malformed: template value should be a string for dictionary value @ data[‘action’][0][‘data’]

Hi there,

I’m struggeling with some automation code and do not know how to fix it. Can anyone of you give me a quick hint?
I was creating an automation with a code part and got message, that value should be a string.

service: input_number.set_value
metadata: {}
data:
  value: >-
    {{ states('input_number.amortisation') | float +
    (states('input_number.einspeisevergutung') | float *
    states('sensor.solaranlage_wechselrichter_export_energy_today') | float) + 
    (state_attr('input_number.strompreis', 'avg_price') | float *
    (states('sensor.solaranlage_wechselrichter_solar_generation_today') | float
    - states('.solaranlage_wechselrichter_export_energy_today') | float) }}
target:
  entity_id: input_number.amortisation

Thank you in advance

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