how to solve invalid structural object class chain

["owen nirvana" <freeespeech@gmail.com>]

I try to a entry like this:
cn = .. ,dc=..,dc=..,dc=..,dc=..
cn = ..
objectClass: person
objectClass: inetOrgPerson
objectClass: organizatinoalRole
objectClass: device
objectClass: pkiUser
roleOccupant: ...
employeeNumber : ..
userCertificate;binary :: BASE64 Encode
icSerilNumber: ..
tel: ...
fax: ...
telex: ..

log reports " invalid structural object class chain in
organizatinoalRole/Person or organizatinoalRole/inetOrgPerson etc"
I try many combination about the  order of person ,inetOrgPerson and
organizatinoalRole, and the same error was reported.

thanks for help
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