ldap_add: Internal (implementation specific) error (80)

[Joao Pereira <joaopedro17@netvisao.pt>]

Need help,
when i do this command:
#ldapadd -x -D "cn=repAdmin,dc=k2comp" -w secrets -f /tmp/newbd.ldif
i have this result:
adding new entry "dc=k2comp"
ldapadd: update failed: dc=k2comp
ldap_add: Internal (implementation specific) error (80)
       additional info: no structuralObjectClass operational attribute

the file /tmp/newbd.ldif
/dn: dc=k2comp
objectclass: dcObject
objectclass: organization
o: 2000 Computadores
dc: k2comp

dn: cn=manager, dc=k2comp
objectclass: organizationalRole
cn: manager

dn: ou=contacts, dc=k2comp
ou: contacts
objectclass: organizationalUnit

dn: dc=otimus, ou=contacts, dc=k2comp
dc: otimus
objectclass: dcObject
objectclass: organization
o: Otimus enterprise

dn: dc=depInf,dc=otimus,oucontacts,dc=k2comp
dc: depInf
objectclass: organizationalUnit
ou: Departamento informatica

/If some1 could help em i apreciate, im using openldap 2.2.26