The following code that I use to import some csv file works okay if I do not use

#!/usr/bin/perl -w
use strict;
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However I get warnings ("uninitialized value") if I'm trying to code the right way. Can someone point me further in the right direction?
Thanks for your reply,
Gert

#!/usr/bin/perl -w
use IO::File;
use Text::CSV_XS;

my $csv = Text::CSV_XS->new( { sep_char => ',' } );
my $io = IO::File->new( 'data.txt', '<' )
  or die "Can't read file: $!\n";

my $number = 10;    # which number to start with?

until ( $io->eof ) {
    my $row = $csv->getline($io); 

    print "Olah:","\t", $number++ , "\t", $row->[2], " ", "\"",
      $row->[5],
      "\"", "\t", "\"", $row->[3],
      $row[0], "\"", " ", $row->[4],
      "\n";
}
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with data: data.txt

"123",20090626,14,"P8","Ba",20090626,"BET 98"
"123",20090626,74,"P2","Ba",20090626,"BET 08"
"123",20090626,47,"03","Av",20090626,"f: 29"
"123",20090626,40,"10","Av",20090626,"ok"
"123",20090629,17,"07","Go",20090629,"Sa"
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