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In the field listed in the error message is there any Median() functions being used? The median function is not supported for Microsoft SQL Sever. http://kb.tableau.com/articles/issue/median-function-unavailable
Additional information: Median Function Unavailable | Tableau Software
Another possibility is if you are using the ODBC connector to connect to Microsoft SQL Server there was a known issue with a Tableau Desktop versions detailed in the below article.
If the above is not the case I would consider reaching out to Tableau Desktop technical support.
Open a support case by selecting the below link.
I hope this helps!
Thanks a lot, yes I am using Median function in all my visualizations.