Error "System error: null" when running a flow which uses Custom SQL in Tableau Prep

KNOWLEDGE BASE

Error "System error: null" when running a flow which uses Custom SQL in Tableau Prep

Published: 19 Nov 2018
Last Modified Date: 31 Aug 2020

Issue

When running a flow which joins input nodes from Custom SQL in Tableau Prep, the following error might occur:

"System error: null"

"System error: com.tableau.loom.exceptions.OutputNodeFailureException: Unable to process output step: Failure loading Data Source: Internal Error - An unexpected error occurred and the operation could not be completed."

Environment

Tableau Prep Builder

Resolution

Option 1

Upgrade to Tableau Prep 2019.1.1, or a newer version. For more information, see Upgrade Tableau Prep, and Tableau Prep Downloads and Release Notes.

Cause

This behavior is related to known issue ID 845634 and was resolved in the 2019.1.1 release of Tableau Prep, and all more recent versions.

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