This smells like a binary \r is inside an unquoted field and the binary option is not passed to the parser. What versions of Text::CSV (and if installed Text::CSV_XS) and Tie::Array::CSV are you using?
It might help to also show us a hextdump of the data that fails.
In reply to Re^3: Compare and group unmatched records from 2 CSV files together
by Tux
in thread Compare and group unmatched records from 2 CSV files together
by KIASohc
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