unable to get contact details to show up in roundcube

[associates]

Hi,

I am having problem with getting my LDAP to work with Roundcube-0.9.5 on ubuntu Server 12.04. The problem is after logging into roundcube webmail, I click on "Address Book". I can see the name of my LDAP address book (i.e. Example LDAP Addressbook) on the list but when I double-clicked it, it showed no contents. This is very strange since I added two dummy user details to it for a test.

Here is the LDAP log:
[02-Apr-2014 16:02:31 +1100]: C: Connect [example.com:389] [Example LDAP Addressbook]
[02-Apr-2014 16:02:31 +1100]: S: OK
[02-Apr-2014 16:02:31 +1100]: C: Bind [dn: cn=admin,dc=example,dc=com] [pass: PASSWD]
[02-Apr-2014 16:02:31 +1100]: S: OK
[02-Apr-2014 16:02:31 +1100]: C: Read [dn: cn=Aaron Smith,ou=addressbook,dc=example,dc=com] [(objectclass=*)]
[02-Apr-2014 16:02:31 +1100]: S: OK
[02-Apr-2014 16:02:31 +1100]: C: Search [(objectClass=groupOfNames)][dn: ou=addressbook,dc=example,dc=com]
[02-Apr-2014 16:02:31 +1100]: S: 0 record(s)
[02-Apr-2014 16:02:31 +1100]: C: Close
[02-Apr-2014 16:02:33 +1100]: C: Connect [example.com:389] [Example LDAP Addressbook]
[02-Apr-2014 16:02:33 +1100]: S: OK
[02-Apr-2014 16:02:33 +1100]: C: Bind [dn: cn=admin,dc=example,dc=com] [pass: PASSWD]
[02-Apr-2014 16:02:33 +1100]: S: OK
[02-Apr-2014 16:02:33 +1100]: C: Read [dn: cn=Owen Millan,ou=addressbook,dc=example,dc=com] [(objectclass=*)]
[02-Apr-2014 16:02:33 +1100]: S: OK
[02-Apr-2014 16:02:33 +1100]: C: Search [(objectClass=groupOfNames)][dn: ou=addressbook,dc=example,dc=com]
[02-Apr-2014 16:02:33 +1100]: S: 0 record(s)
[02-Apr-2014 16:02:33 +1100]: C: Close

From the log files, I can see that it's behaving well as expected.

In the main.inc.php under roundcube, I have the following set:
$rcmail_config['ldap_public']['public'] = array(
    'name'              => 'Example LDAP Addressbook',
    'hosts'              => array('example.com'),
    'port'                => 389,
    'user_specific' => false,
    'base_dn'         => 'ou=addressbook,dc=example,dc=com',
    'bind_dn'          => 'cn=admin,dc=example,dc=com',
    'bind_pass'      => 'PASSWD',
    'filter'              => '(objectClass=inetOrgPerson)',
    'groups'           => array(
        'base_dn'           => '',     // in this Howto, the same base_dn as for the contacts is used
        'filter'                 => '(objectClass=groupOfNames)',
        'object_classes' => array("top", "groupOfNames"),
  ),
);

I am wondering if anyone might be able to point me to right direction on this.

Thank you very much and any help would be greatly appreciated.