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canonical: en/troubleshooting/errors/ERR-DS_API-AVATAR-NOT_FOUND-FIELD_REF.html
title: DataLens On-premises error ERR.DS_API.AVATAR.NOT_FOUND.FIELD_REF
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  This page describes the Field references an unknown source avatar DataLens
  On-premises error.
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# [DataLens On-premises] Field references an unknown source avatar

`ERR.DS_API.AVATAR.NOT_FOUND.FIELD_REF`

This error occurs when a dataset field references a table that was previously deleted. [Replace the field source](../../dataset/create-dataset.md#replace-field) in the dataset: click the **Field source** and specify a valid table or delete the incorrect field.