"requires explicit package name"

Please help.

##</code><code>##

use strict;
use warnings;

package Net::SFTP;
my %args = (ssh_args => {});
$args(user) = $user
$args(password) = $password
$args(ssh_args)->(port) = 22;
my $sftp = Net::SFTP->($host, %args);


my $user = 'test@testserver';
my $password = 'password';