Illegal field name when using dbt_utils.pivot

[zaz]

@zaz

select
  repayment_month,
  {{ dbt_utils.pivot('Repayment_Due_Month',dbt_utils.get_column_values(ref('trades'), 'volume')) }}
from {{ ref('trades') }}
group by repayment_month

when i change it to volume i get : Illegal field name: 900? sorry which argument do you mean… as the get column values would be setting every numeric field in volume as column header no?