[Samba] cannot join win2k to samba domain

[andry]

hi,
i 've problem when i try to join win2k prof into samba 
domain 
i use samba ver 2.2.1a 
i add admin user as "domain admin group=admin" in global 
sections
but when i type user name and pass error message appear " 
the spesified user doesn't exist".

any one can help me....how to solve my problem?!
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