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  1. or download this
    my %error_per_file;
    my %error_type;
    
    ...
        $error_type{$errnum}++;
        $error_per_file{$filename}->{$errnum}++;
    }
    
  2. or download this
    my $column = 1;
    my %column_for = map ($_ => $column++), sort keys %error_type;
    $column_for{Filename} = 0;
    
  3. or download this
    $worksheet->write(0, $column_for{$col_name}, $col_name) for keys %column_for;
  4. or download this
    my $row = 1;
    for my $filename (sort keys %error_per_file){
        $worksheet->write($row, 0, $filename)
    ...
            while ($errnum, $occurences) = each %{$error_per_file{$filenam
    +e}};
        ++$row;
    }