Unable to Append Data To Extract From a .csv File

Published: 07 Mar 2017
Last Modified Date: 12 Jul 2017


When attempting to append data to an extract from a .csv file in Tableau Desktop 10.2, the following error might occur: 
"Internal Error - An Unexpected error occur ed and the operation could not be completed"


  • Tableau Desktop 10.2.0
  • Windows 7 Enterprise
  • Text Files


Option 1

Upgrade to Tableau Desktop 10.3. For more information, see Upgrading Tableau Desktop.

Option 2

Try one of the following alternative workarounds: 
  • Add the CSV as a second connection and use Append Data from Data Source instead of Append Data from File.
  • Perform a wildcard union in a single data connection, and then create the extract. See Union Wildcard Search for more information. 
  • Build a manual union using the following steps:
  1. Connect to the primary file
  2. Select Extract
  3. Connect to the file with the data you want to add.
  4. Drag the second  file out to create a new union.
  5. keep the default 'specific (manual)' union option.
  6. Update both files 
  7. Refresh the extract to update with the new rows.


This behavior is related to a known issue (ID: 625052) that has been fixed in a later version of Tableau Desktop. 
Did this article resolve the issue?