[Zope] ldap

Hi! I'm looking for a zope-ldap howto. In particular I need to use a ldap connection in a zpt and I set Connection and Filter LDAP correctly (in test page) but not in a zpt (I have a key error on ldap filter) Anyone can help me? Thanks, Fabio -- Dott. Fabio Marcone 2T srl Telefono +39 - 0871- 540154 Fax +39 - 0871- 571594 Indirizzo Viale B. Croce 573, 66013 Chieti Scalo (CH)