[Ssh-sftp-perl-users] SSH Pubkey problem

[Cali <cit...@in...>]

I'm trying to setup a connection, and in some host i did but in others i 
can´t.
This is my script:
use Net::SSH::Perl;
use Net::SFTP;
my $host = "xxxxx";
my $identity = $ENV{HOME}."/.ssh/id_rsa";
my %params  = (debug            =>1,
#           identity_files      =>[$identity],
             options             =>["HostbasedAuthentication 
no","PasswordAuthentication no","PubkeyAuthentication no"],
             protocol            => '2'
#           port                => 80
);

#my %args = (
#       'user'          => 'xxxxxx',
#       'password'      => 'xxxxxx',
#       'debug'         => '1',
#       'ssh_args'      => ["HostbasedAuthentication 
yes","PasswordAuthentication yes"]
#);

#my $sftp = Net::SFTP->new($host,%args);
#$sftp->put("yo.txt", "/home/cguerrero/yo.txt");
my $cfg = Net::SSH::Perl::Config->new($host);
$cfg->read_config("/etc/ssh_config");
$cfg->merge_directive("PubkeyAuthentication no");
my $ssh = Net::SSH::Perl->new($host,%params);
$ssh->login('xxxxx','xxxx');
my ($stdout, $stderr, $exit) = $ssh->cmd("mkdir kali");
warn ("error performing command: $command ($stderr)") if ($exit);
print $stdout;
print "Envio archivo";
exit;

And this is what i get on the screen:
cluster1 sftp # perl sftp.pl
cluster1: Reading configuration data /root/.ssh/config
cluster1: Reading configuration data /etc/ssh_config
cluster1: Allocated local port 1023.
cluster1: Connecting to 10.22.6.90, port 22.
cluster1: Remote protocol version 2.0, remote software version 
OpenSSH_3.8.1p1 Debian 1:3.8.1p1-11ubuntu3.1
cluster1: Net::SSH::Perl Version 1.25, protocol version 2.0.
cluster1: No compat match: OpenSSH_3.8.1p1 Debian 1:3.8.1p1-11ubuntu3.1.
cluster1: Connection established.
cluster1: Sent key-exchange init (KEXINIT), wait response.
cluster1: Algorithms, c->s: 3des-cbc hmac-sha1 none
cluster1: Algorithms, s->c: 3des-cbc hmac-sha1 none
cluster1: Entering Diffie-Hellman Group 1 key exchange.
cluster1: Sent DH public key, waiting for reply.
cluster1: Received host key, type 'ssh-dss'.
cluster1: Host '10.22.6.90' is known and matches the host key.
cluster1: Computing shared secret key.
cluster1: Verifying server signature.
cluster1: Waiting for NEWKEYS message.
cluster1: Enabling incoming encryption/MAC/compression.
cluster1: Send NEWKEYS, enable outgoing encryption/MAC/compression.
cluster1: Sending request for user-authentication service.
cluster1: Service accepted: ssh-userauth.
cluster1: Trying empty user-authentication request.
cluster1: Authentication methods that can continue: 
publickey,keyboard-interactive.
cluster1: Next method to try is publickey.
Permission denied at sftp.pl line 25

Any idea????

thanx