adduser says user exists when the user does not exist

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http://askubuntu.com – As the subject says, I'm trying to add a new user. When I run the command, it says the user already exists. But looking in /etc/passwd, /etc/group, and /etc/shadow shows that the user does not exist. Running the command on my local machine works just fine. I'm running Ubuntu 11.10 on both. Here's my terminal commands and output: root@ws-prod-www-01:~# useradd -s /sbin/nologin -m -d /var/www/html/atc -g 33 -u 10141 atc useradd: user 'atc' already exists root@ws-prod-www-01:~# grep atc /etc/passwd speech-dispatcher:x:111:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh root@ws-prod (HowTos)