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Those errors are usually nothing to be concerned with, and indicate Tableau Server is either cleaning up a file that has already been removed, or a file that is still in use cannot be cleaned up. They are logged at the INFO level because they might prove useful to a Support investigation, but you can safely ignore them on a day-to-day basis.
If you see an issue that feels related to these messages, opening a case with Technical Support will let them investigate further. Thank you