[turba] Browse problem

[David]

Hi to everyone,
I've a little problem with turba address book. I can't list all my contacts. I 
can only 
search in my contacts list.

if I try to force link to www.mysite.it/horde/turba/browse.php I recive the 
folling error:

 There are no browseable address books.


These are my configuration:

Horde: 3.1 (6 march build)
IMP:   4.1 (6 march build)
Turba: 2.1 (6 march build)

backend: mysql 4.1.1 (debian)

(same error on turba 2.1

!!! conf.php

$conf['menu']['import_export'] = true;
$conf['menu']['apps'] = array('imp');
$conf['client']['addressbook'] = 'localsql';
$conf['comments']['allow'] = true;
$conf['documents']['type'] = 'horde';

!!!  prefs.php
defaul file, no modifications

!!! source.php

$cfgSources['localsql'] = array(
    'title' => _("My Address Book"),
    'type' => 'sql',
    'params' => array_merge($conf['sql'], array('table' => 'turba_objects')),
    'map' => array(
        '__key' => 'object_id',
        '__owner' => 'owner_id',
        '__type' => 'object_type',
        '__members' => 'object_members',
        '__uid' => 'object_uid',
        'name' => 'object_name',
        'email' => 'object_email',
        'alias' => 'object_alias',
        'homeAddress' => 'object_homeaddress',
        'workAddress' => 'object_workaddress',
        'homePhone' => 'object_homephone',
        'workPhone' => 'object_workphone',
        'cellPhone' => 'object_cellphone',
        'fax' => 'object_fax',
        'title' => 'object_title',
        'company' => 'object_company',
        'notes' => 'object_notes',
        'pgpPublicKey' => 'object_pgppublickey',
        'smimePublicKey' => 'object_smimepublickey',
        'freebusyUrl' => 'object_freebusyurl'
    ),
    'search' => array(
        'name',
        'email'
    ),
    'strict' => array(
        'object_id',
        'owner_id',
        'object_type',
    ),
    'public' => false,
    'readonly' => false,
    'admin' => array(),
    'export' => true
);

$cfgSources['prefs'] = array(
    'title' => _("Private Address Book"),
    'type' => 'prefs',
    'params' => array(
        'name' => 'prefs',
        'charset' => NLS::getCharset()
    ),
    'map' => array(
        '__key' => 'id',
        '__type' => '_type',
        '__members' => '_members',
        '__uid' => 'uid',
        'name' => 'name',
        'email' => 'mail',
        'alias' => 'alias'
    ),
    'search' => array(
        'name',
        'email',
        'alias'
    ),
    'strict' => array(
        'id',
        '_type',
    ),
    'public' => false,
    'readonly' => false,
    'export' => true
);

Can someone help me?
Thank you in advance