[Koha] zebra problem

hi to all i'm installed koha on debian in last steps in zebra when i run sudo -u {KOHA_USER} zebrasrv -f /etc/koha/koha-conf.xml i get sudo: no passwd entry for {KOHA_USER}! what i shall do now . and when i write in my browser localhost:8080 i get apache page it works . any suggestions , help thank's ti all _________________________________________________________________ News, entertainment and everything you care about at Live.com. Get it now! http://www.live.com/getstarted.aspx