[turba] Problem upgrading from 2.1 to 2.2

[Josh Endries]

Jan  1 15:53:01 www php: PHP Notice:  Undefined property: 
Horde_Share_datatree::$_storage in 
/var/www/horde-3.2-rc1/turba/scripts/upgrades/2007-06-17_flatten_shares.php on 
line 48
Jan  1 15:53:01 www php: PHP Notice:  Trying to get property of non-object in 
/var/www/horde-3.2-rc1/turba/scripts/upgrades/2007-06-17_flatten_shares.php on 
line 49
Jan  1 15:53:01 www php: PHP Fatal error:  Call to a member function getAssoc() 
on a non-object in 
/var/www/horde-3.2-rc1/turba/scripts/upgrades/2007-06-17_flatten_shares.php on 
line 53

The code is:

$primary_source = $sourceTypes[0];
$datatree = $turba_shares->_storage;
$db = $datatree->_db;

No idea...I have RC1 of Horde installed, and everything seemed to be working 
(IMP, DIMP, and other apps are running fine).