[Serusers] "domain unknown" when add user

[Suranut Sappaso]

After install ser, i can not add user to the system it show
this message "domain unknown: use usernames with domain or set default domain in
SIP_DOMAIN freebsd".
Before install ser i've add SIP_DOMAIN in /etc/profile allready. Does
anybody found this problem before? Please tell me how to fix this
problem. 

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Suranut Sappaso
Computer Center,
Khon Kaen University