Thank it2000! After trail and error many times, I found bad LDAP data. Suppose you have LDAP data,
dn: uid=userA,ou=users,ou=company.com
objectClass: top
objectClass: inetOrgPerson
objectClass: organizationalPerson
objectClass: person
uid: userA
cn: User A
givenName: A
sn: User
mail: usera@company.com
userPassword: password
dn: uid=userA,ou=users,ou=company.com
objectClass: top
objectClass: inetOrgPerson
objectClass: organizationalPerson
objectClass: person
uid: userB
cn: User B
givenName: B
sn: User
mail: userb@company.com
userPassword: password
dn: uid=userC,ou=users,ou=company.com
objectClass: top
objectClass: inetOrgPerson
objectClass: organizationalPerson
objectClass: person
uid: userC
cn: User C
givenName: C
sn: User
mail: userc@company.com
userPassword: password
dn: cn=G1,ou=groups,ou=company.com
objectClass: top
objectClass: groupOfUniqueNames
cn: G1
description: Group One
uniqueMember: userA
uniqueMember: userB
dn: cn=G2,ou=groups,ou=company.com
objectClass: top
objectClass: groupOfUniqueNames
cn: G2
description: Group Two
uniqueMember: userC
Error be occure. I fix bug by modify uniqueMember like these
dn: cn=G1,ou=groups,ou=company.com
objectClass: top
objectClass: groupOfUniqueNames
cn: G1
description: Group One
uniqueMember: uid=userA,ou=users,ou=company.com
uniqueMember: uid=userB,ou=users,ou=company.com
dn: cn=G2,ou=groups,ou=company.com
objectClass: top
objectClass: groupOfUniqueNames
cn: G2
description: Group Two
uniqueMember: uid=userC,ou=users,ou=company.com
Thank,
Yoonsak