python ldap bind error

[Jorge Alberto Diaz Orozco]

hi there.
I'm working with python ldap and I need to authenticate my user.
this is the code I'm using.

import ldap
ldap.set_option(ldap.OPT_REFERRALS,0)
ldap.protocol_version = 3
conn = ldap.initialize("ldap://ldap.domain.cu")
conn.simple_bind_s("user at domain.cu","password")

every time I do this it gives me the next error:
ldap.INVALID_DN_SYNTAX: {'info': 'invalid DN', 'desc': 'Invalid DN syntax'}

can someone help me???
I don't know what I'm doing wrong

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