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# [DataLens On-premises] Unknown field

`ERR.DS_API.FIELD.NOT_FOUND`

Nonexistent field used.

This error occurs whenever a chart uses a field with an identifier that is not in the dataset.
This field could have been deleted from the dataset after the chart was created.

To fix this error:

1. [Update fields](../../dataset/create-dataset.md#update-fields) in a dataset.
1. [Change](../../dataset/create-dataset.md#replace-field) or delete the fields highlighted in red.
1. Save the dataset.