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# CSV_XS ERROR: 1012 - INI - the header contains an empty field @ rec 
+1 pos 0

       If the header is empty,  contains more than one unique separato
+r out of
       the allowed set,  contains empty fields,   or contains identica
+l fields
       (after folding), it will croak with error 1010, 1011, 1012, or 
+1013
       respectively.

my $csv = Text::CSV ({ binary => 1, auto_diag => 1 });