LDAP ERROR 35

Hi

I am using Windchill 9.1 M070.I am coming across an error while i am trying to add users in the users table in Participant Administrator.It says nullnull [ldap error 34 The provided value nullnull could not be parsed as a valid distinguised name because the last non space character was part of the attribute name

'nullnull'']

Kindly suggest me ways to solve this issue.

Thanks in advance!