Getting an error during installation with ldap. Latest Version of Zimbra and Mac OS X 10.5.4 Server

The error in the log file is

***running as zimbra user: /opt/zimbra/libexec/zmldapinit
TLS: 00000000: LdapErr: DSID-0C090CF0, comment: Error initializing SSL/TLS, data 0, vece^@
failed. (256)

ERROR

Configuration failed.