Please read links to Whonix wiki. Answers usually won’t be copied/duplicated here if already answered in wiki.
Safely Use Root Commands
Don’t. There is no need to copy a folder to user home folder and make it owned by root.
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Don’t break permissions as per Safely Use Root Commands
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Don’t break as per documentation: Tor Browser Essentials
This should also already be mentioned in the error message, link should be already included there.