Flow with Excel, Text File Data Connections Sometimes Stuck at 'Generating flow and validating schema' Process

Published: 27 Feb 2021
Last Modified Date: 08 Jul 2022


When running the flow in Tableau Prep Builder, the flow appeared to being processed; however, hung at the stage where 'Generating flow and validating schema...' remained on the screen at the upper right in Tableau Prep Builder.
It may occur when using a wide Excel file or many, different text file tables as inputs.


  • Tableau Prep Builder 2020.3.3, 2020.4.1
  • Windows 10
  • Excel


Upgrade to Tableau Prep Builder 2021.1 or later.


This was a known issue for which the development team provided a fix in the later Tableau Prep Builder releases.
Did this article resolve the issue?