apache, sudo, useradd problem

hi: Im triying to setup apache with useradd permission,using sudo my setup is: wwwrun ALL=NOPASSWD:/usr/sbin/useradd but no matter how I configure it,it keeps asking a password (the wwwrun user password??:S) and the log file says: /usr/bin/sudo: wwwrun : 1 incorrect password attempt ; TTY=unknown ; PWD=/xxx ; USER=root ; COMMA ND=/usr/sbin/useradd ideas? thanks.