Error "Internal Error..." When Creating Joins or Opening Workbooks With Joins

Published: 10 Mar 2017
Last Modified Date: 10 Dec 2018


When creating a new join in Tableau Desktop 10.2, or opening a workbook containing a join, the following error might occur: 
"Internal Error - An unexpected error occurred and the operation could not be completed"


  • Tableau Desktop 10.2.0
  • Oracle, MS SQL Server


The issue appears to occur when an attempt is made to join tables where one or more table contains a data type that Tableau Desktop does not support. The expected behavior is that these data types will simply be ignored. See the Related Link for some of these data types with Oracle.

Additional Information

This behavior is related to a known issue (ID: 628169) that has been fixed in a later version of Tableau Desktop. 
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