I am following the link to configure ldap on ubuntu 10.04 server but could not.

when I try to use sudo ldapadd -x -D cn=admin,dc=don,dc=com -W -f frontend.ldif I'm getting the following error:

Enter LDAP Password: <entered 'secret' as password>
adding new entry "dc=don,dc=com"
ldap_add: Naming violation (64)
      additional info: value of single-valued naming attribute 'dc' conflicts with value present in entry

Again when I try to do the same, I'm getting the following error:

root@avy-desktop:/home/avy# sudo ldapadd -x -D cn=admin,dc=don,dc=com -W -f frontend.ldif
Enter LDAP Password:
ldap_bind: Invalid credentials (49)

Here is the backend.ldif file

# Load dynamic backend modules
dn: cn=module,cn=config
objectClass: olcModuleList
cn: module
olcModulepath: /usr/lib/ldap
olcModuleload: back_hdb

# Database settings
dn: olcDatabase=hdb,cn=config
objectClass: olcDatabaseConfig
objectClass: olcHdbConfig
olcDatabase: {1}hdb
olcSuffix: dc=don,dc=com
olcDbDirectory: /var/lib/ldap
olcRootDN: cn=admin,dc=don,dc=com
olcRootPW: secret
olcDbConfig: set_cachesize 0 2097152 0
olcDbConfig: set_lk_max_objects 1500
olcDbConfig: set_lk_max_locks 1500
olcDbConfig: set_lk_max_lockers 1500
olcDbIndex: objectClass eq
olcLastMod: TRUE
olcDbCheckpoint: 512 30
olcAccess: to attrs=userPassword by dn="cn=admin,dc=don,dc=com" write by anonymous auth by self write by * none
olcAccess: to attrs=shadowLastChange by self write by * read
olcAccess: to dn.base="" by * read
olcAccess: to * by dn="cn=admin,dc=don,dc=com" write by * read

frontend.ldif file:

# Create top-level object in domain
dn: dc=don,dc=com
objectClass: top
objectClass: dcObject
objectclass: organization
o: Example Organization
dc: Example
description: LDAP Example 

# Admin user.
dn: cn=admin,dc=don,dc=com
objectClass: simpleSecurityObject
objectClass: organizationalRole
cn: admin
description: LDAP administrator
userPassword: secret

dn: ou=people,dc=don,dc=com
objectClass: organizationalUnit
ou: people

dn: ou=groups,dc=don,dc=com
objectClass: organizationalUnit
ou: groups

dn: uid=john,ou=people,dc=don,dc=com
objectClass: inetOrgPerson
objectClass: posixAccount
objectClass: shadowAccount
uid: john
sn: Doe
givenName: John
cn: John Doe
displayName: John Doe
uidNumber: 1000
gidNumber: 10000
userPassword: password
gecos: John Doe
loginShell: /bin/bash
homeDirectory: /home/john
shadowExpire: -1
shadowFlag: 0
shadowWarning: 7
shadowMin: 8
shadowMax: 999999
shadowLastChange: 10877
mail: [email protected]
postalCode: 31000
l: Toulouse
o: Example
mobile: +33 (0)6 xx xx xx xx
homePhone: +33 (0)5 xx xx xx xx
title: System Administrator
postalAddress:
initials: JD

dn: cn=example,ou=groups,dc=don,dc=com
objectClass: posixGroup
cn: example
gidNumber: 10000

Anybody could help me?