What's wrong with this statement in perl?

Posted by benjamin button on Stack Overflow See other posts from Stack Overflow or by benjamin button
Published on 2010-05-03T10:18:48Z Indexed on 2010/05/03 10:28 UTC
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print "$_", join(',',sort keys %$h),"\n";

Use of uninitialized value in string at missing_months.pl line 36.
1,10,11,12

foreach my $num ( sort keys %hash )
{
        my $h = $hash{$num};
        print "$_", join(',',sort keys %$h),"\n";
}

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