problem starting second instance of barnyard

I am trying to run 2 instances of barnyard.
 I have used the -X pidfile option, but I still get the following
error message:

# /etc/init.d/barnyard.eth0 start
barnyard process already running, pid:
4129

Here are my configuration options in
the init.d script:

ARCHIVEDIR=/var/snort/processed
BARNYARD=/usr/local/bin/barnyard
SUDO=""
CONFFILE=/usr/local/barnyard/barnyard.conf.eth0
SPOOLDIR=/var/log/snort/eth0
SPOOLBASE=snort.log
GENFILE=""
LOGDIR=""
SIDFILE=""
TIMESTAMP=""
WALDO="/var/log/snort/barnyard.eth0.waldo"
PIDFILE="/usr/local/barnyard/pid/eth0.pid"

Any ideas what may be causing this?