[turba] problem of convert_datatree_shares_to_sql.php in turba-2.2

[David Chang]

I have error message returned,while execute  
convert_datatree_shares_to_sql.php under  turba-2.2/scripts/upgrades

#cd turba-2.2/scripts/upgrades
#php -f ./convert_datatree_shares_to_sql.php
Do you want to keep your old datatree data or delete it?
     (0) Keep
     (1) Delete

Type your choice: 1
Data will be copied into the new tables, and WILL be deleted from the  
datatree.
  Is this what you want?
     (y) Yes
     (n) No

Type your choice: y
[  INFO  ] Migrating share data for share_id: 45169

Fatal error: Call to undefined method MDB2_Error::execute() in  
/usr/local/apache/horde-rc/turba/scripts/upgrades/convert_datatree_shares_to_sql.php on line  
165

David