Sort_Table come from

use Sort::Array qw(Sort_Table);
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the array comes from the parsing of several log files
and I build it in that way

$eventi[$count][0]=$feed;
$eventi[$count][1]=$1;
$eventi[$count][2]="Restored";
$eventi[$count][3]="$var"

1 Sep 17 06:16:36 Restored a
1 Sep 22 06:22:40 Fault b     
1 Sep 22 06:25:05 Restored a
1 Sep 22 12:36:19 Fault
1 Sep 22 12:37:10 Restored b
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the date is the second field
and count goes from 0 to n
so I achieve a matrix n x 4
I want to sort it by one of its columns
If I set the parameter structure = 'csv' it doesn't sort,
if I set strucure = 'single'the output is an error:
Use of uninitialized value in concatenation (.) or string

Edit: BazB more code tags.