samba - Jul 2004 - Problems Samba with LDAP

Hi all,
     I'm trying to use Samba with ldap, and when i user try to logon
in my domain, i got this message in my log:

string_to_sid: Sid 
S-1-5-21-1555867097-2400918380-3197679675-3040-2027 does not start
with 'S-'

    how can i solve this? 

Thanks,

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