Updated code to check $stderr and $exit. $stdout and $stderr have undefined. Do I need to initialize $STDOUT to $stdout

Output from the updated code

#!/usr/bin/env perl -w

use strict;
use warnings;
use Data::Dumper;
use Net::SSH::Perl;

######################################################################
+#
# LOGIN DETAILS
######################################################################
+#
my $server = "10.255.255.10";
my $username = "username";
my $password = "password";

# Log into server
print "Creating ssh object... ";
my $ssh = Net::SSH::Perl->new($server); # Error check this
print "done\n";
print "Logging into server... ";
$ssh->login($username, $password); # Error check this
print "done\n";

# Check df
my $command = 'df';
print "Running command ($command)... ";
my ($stdout, $stderr, $exit) = $ssh->cmd($command); # Check output
print "done\n";

print "$stdout\n";
print "$stderr\n";
print "$exit\n";

$ssh->cmd("exit");
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[root@server-01 New_script]#perl New_script.pl
Creating ssh object... done
Logging into server... done
Running command (df)... done
Use of uninitialized value $stdout in concatenation (.) or string at w
+lgw2.pl line 29.

Use of uninitialized value $stderr in concatenation (.) or string at w
+lgw2.pl line 30.

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