[Yandex Cloud documentation](../../../index.md) > [Yandex DataLens](../../index.md) > Troubleshooting > File check failed

# [Yandex DataLens] File check failed

`ERR.FILE.UNSUPPORTED_DOCUMENT`

Unsupported file format.

This error occurs when trying to create a connection to an `XLSX` table from Google Sheets.

To fix it, save the table in Google Sheets format: in the table menu, select **File** → **Save as Google table**.