Try to refresh your Database once.
1 of 1 people found this helpful
when we have some internet down or server down or some db issue then it will give us some error.
Can you restart the tableau server and refresh db.
Provide more information about what was happening right before this happened. What version of Server? What is the data source? Details please.
We had the same issue and Tableau Support team told us that the issue is resolved in 8.2.7 & 8.3.2 version.