Errors "LogicException: Internal Error An unexpected error occurred and the operation could not be completed" Opening Published View

Issue

When opening a view published to Tableau Server, the following error might occur:

Unknown Server Error

An unexpected error occurred on the server. If you continue to receive this error please contact your Tableau Server Administrator.

LogicException: Internal Error An unexpected error occurred and the operation could not be completed.

In addition, the following error appears in the VizQL log files:

"LogicAssert at D:\\builds\\tableau-8-2\\tableau-8-2.14.0611.2328\\tableau-1.3\\src\\data\\Domain.cpp line 131: value.GetDataType( ) == m_dataType"

Environment

Tableau Server
Live data source

Resolution

Any fields whose data type has been changed from Default need to be changed back. If a different data type is required, a calculated field can be used to change the data type and create a new field that can be used in visualizations.

Cause

This error is caused by a data mismatch issue, when the data type is changed from "Default". Tableau Server is requesting a field from the data source that is a different data type than what the data source is expecting, and the data source is returning an error.