ldap_add: Object class violation (65) additional info: no structural object class provided

[Oscar Plameras <oscarp@acay.com.au>]

I'm running openldap-2.1.30 on Linux.

I get an error "...no structural object class provided" when running 
ldapadd on:
ldif1.txt

[oscarp@toshiba openldap]$ cat ldif1.txt
       dn: uid=oscarp, ou=People,dc=tok,dc=com,dc=au
       sambaLogonTime: 0
       displayName: Oscar Plameras
       sambaLMPassword: 552902031BEDE9EFAAD3B435B51404EE
       sambaPrimaryGroupSID: S-1-5-21-2447931902-1787058256-3961074038-1201
       objectClass: posixAccount
       objectClass: sambaSamAccount
       sambaAcctFlags: [UX         ]
       userPassword: secret
       uid: oscarp
       uidNumber: 501
       cn: Oscar Plameras
       loginShell: /bin/bash
       logoffTime: 0
       gidNumber: 100
       sambaKickoffTime: 0
       sambaPwdLastSet: 0
       sambaSID: S-1-5-21-2447931902-1787058256-3961074038-5004
       homeDirectory: /home/oscarp
       sambaPwdCanChange: 0
       sambaPwdMustChange: 0
       sambaNTPassword: 878D8014606CDA29677A44EFA1353FC7

[oscarp@toshiba openldap]$ ldapadd -f ldif1.txt -x -h localhost -D 
"cn=root,o=toshiba,dc=tok,dc=com,dc=au" -W
Enter LDAP Password:
adding new entry "uid=oscarp, ou=People,dc=tok,dc=com,dc=au"
ldapadd: update failed: uid=oscarp, ou=People,dc=tok,dc=com,dc=au
ldap_add: Object class violation (65)
       additional info: no structural object class provided

I have the ff on 'samba.schema':

snip ...........

objectclass ( 1.3.6.1.4.1.7165.2.2.2 NAME 'sambaAccount' SUP top STRUCTURAL
       DESC 'Samba Account'
       MUST ( uid $ rid )
       MAY  ( cn $ lmPassword $ ntPassword $ pwdLastSet $ logonTime $
              logoffTime $ kickoffTime $ pwdCanChange $ pwdMustChange $ 
acctFlags $
              displayName $ smbHome $ homeDrive $ scriptPath $ 
profilePath $
              description $ userWorkstations $ primaryGroupID $ domain ))
                                                                                                                

snip ...........