[Zope] LDAPUserFolder: Add User Problem

Hi, I just installed LDAPUserFolder 2.4 to my Zope 2.7.2 instance. After I configured it, I could Search fror my user id no problem, but when I tried to add a New User, I got this error: AttributeError LDAPDelegate.insert: 'module' object has no attribute 'is_ldap_url'=20 Does this mean I configured LDAP wrong or ??? Thanks, Paul