LDAP search

I am just beginning my foray into Perl with LDAP and I'm not getting what I
expected to get from the LDAP server. If I use ldapsearch like this:

ldapsearch -h ldap.example.com -p 389 -x -b "c=us"

Then I recieve what I expect - everything below the basedn, however when I
attempt the same thing ( I *think* I've written this correctly) in Perl I
get the following error:

"received LDAP error: No such object at ldap_crl.pl line 16, <DATA> line
749."

Any direction would be greatly appreciated.

#!/usr/bin/perl
#
use Net::LDAP;

my $lsvr = 'ldap.example.com';
my $ldap = Net::LDAP->new($lsvr)
    or die "error connecting to $lsvr: $@";

$ldap->bind;   # Bind anonymously, that is, no login and pass

my $results = $ldap->search (                              # Perform a
search for 'nvp'
    filter => "(&(c=US))"
);

if($results->code) {
    die "received LDAP error: @{[$results->error]}";
}

foreach my $entry ($results->all_entries) {
    $entry->dump;
}

$ldap->unbind;   # Unbind and close connection