Ldap , undefined dn

["Amir Saad" <Amir.Saad@bibalex.org>]

i use Fedore 4, Ldap 2.3.11
i'm trying to configre the openldap but i have a problem with ldif files
i run ldapadd -f ia.ldif -x
and i get the error:
ldap_add: Undefined attribute type (17)
        additional info: dn: attribute type undefined
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here is my ldif file:
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# Organization for Test
dn:dc=mydomain,dc=org
objectClass: dcObject
objectClass: organization
o:Test
description: Test
# Organizational Role for Directory Manager
dn:cn=Head,dc=mydomain,dc=org
objectClass: organizationalRole
cn: Head
name: my_name
description: my Head
***************************************************************
here is the include part of my slapd.conf:
include /usr/local/etc/openldap/schema/core.schema
include /usr/local/etc/openldap/schema/cosine.schema
include /usr/local/etc/openldap/schema/inetorgperson.schema
include /usr/local/etc/openldap/schema/nis.schema
include /usr/local/etc/openldap/schema/openldap.schema
***************************************************************
i hope u can help
thanks