This is an issue that is currently being investigated by the Tableau Development team. Please submit a case so the Tableau Development team can engage via Support and gather the necessary information to identify the root of the issue.
For others that might alos be experiencing the issue. This is the KB article that is currently tracking the issue: Error "You are using Server version: null but the minimum compatible version is: 10.0." Signing into Tableau Server via …
Hope this helps!