(ITS#6605) Webmin LDAP User Module Don't Work

Full_Name: Andrea Minardi Version: 2.3.27 OS: RedHat 5 URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (88.40.179.242)

Webmin's LDAP Users and Groups module stopped working after upgrading from Webmin 1.400 to webmin 1.510

I have been using Webmin's LDAP Users and Groups module on my company's server to administer users. It was working fine on Webmin 1.400, but after upgrading I get the error:

"Webmin has connected to the LDAP server, but failed to fetch the schema. Make sure that access has not been denied in the LDAP Server module."