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# [DataLens On-premises] Data preparation not finished

`ERR.DS_API.DB.DATA_PREPARATION_NOT_FINISHED`

Data preparation is not complete yet; wait a few more minutes or reload the data.




You get this error if the file upload is not yet fully processed in the [file](../../operations/connection/create-file.md) connection.

The error also occurs when [importing workbooks](../../workbooks-collections/export-and-import.md#import-workbook) with such connections. To fix this error, reload the data after importing the workbook.