I cleaned it up. Try this:

#!perl 

use strict;
use warnings;

use Net::SFTP;

my $host = 'localhost';
my $user = 'user';
my $pass = 'password';

my %args = ( user      => $user,
             password  => $pass,
             port      => 22, 
             debug     => 1
);

my $local  = 'D:\\test.txt';
my $remote = '/dir1/dir2/test.txt';

my $sftp = Net::SFTP->new($host, %args);
die "Can't put file: $!\n" unless 
$sftp->put($local, $remote);
close $local;
[download]

Update: Fixed typo.