send_ldap_result: err=0 matched="" text=""

[Amir Saad <eng__amir@hotmail.com>]

I'm getting the following error when I run getent group:
Nov  8 15:45:29 machine1 slapd[2004]: SRCH "ou=Group,dc=mydomain,dc=com" 2 0
Nov  8 15:45:29 machine1 slapd[2004]:     0 0 0
Nov  8 15:45:29 machine1 slapd[2004]:     filter: (objectClass=*)
Nov  8 15:45:29 machine1 slapd[2004]:     attrs:
Nov  8 15:45:29 machine1 slapd[2004]:
Nov  8 15:45:29 machine1 slapd[2004]: bdb_idl_fetch_key: @ou=group,dc=mydomain,dc=com
Nov  8 15:45:29 machine1 slapd[2004]: connection_get(10)
Nov  8 15:45:29 machine1 slapd[2004]: connection_get(10)
Nov  8 15:45:29 machine1 slapd[2004]: send_ldap_result: err=0 matched="" text=""
Nov  8 15:45:29 machine1 slapd[2004]: connection_get(10)

When I run ldapsearch -Y GSSAPI -b 'ou=group,dc=mydomain,dc=com'  I get many records, what is wrong? Here is my /etc/libnss_ldap.conf:
base dc=mydomain,dc=com
uri ldaps://machine1
ldap_version 3
nss_base_passwd ou=People,dc=mydomain,dc=com
nss_base_shadow ou=People,dc=mydomain,dc=com
nss_base_group ou=Group,dc=mydomain,dc=com
ssl start_tls
ssl on
use_sasl on
sasl_auth_id
sasl_auth_id nssldap/machine1

My server is Debian 4 and I installed all packages using apt-get
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