IssueAfter restoring a backup of Tableau Server, and when viewing a workbook which uses an extract that has a file name containing Unicode characters, the following error might occur:
Unknown Server Error
An unexpected error occurred. If you continue to receive this error please contact your Tableau Server Administrator.
TableauException: Tableau Data Engine Error: 4: Invalid Command: database: Path does not exist. Unable to connect to the server "<Server Name>" Check that the server is running and that you have access privileges to the requested database.