Insecure dependency in rename while running with -T switch at (F) You tried to do something that the tainting mechanism didn't like. The tainting mechanism is turned on when you're running setuid or setgid, or when you specify -T to turn it on explicitly. The tainting mechanism labels all data that's derived directly or indirectly from the user, who is considered to be unworthy of your trust. If any such data is used in a "dangerous" operation, you get this error. See perlsec for more information. Uncaught exception from user code: Insecure dependency in rename while running with -T switch at