This is telling you to intialise the tripwire program and generate a baseline database of your system.
# twadmin -m P /etc/tripwire/twpol.txt
# tripwire -m i
Then do a check
# tripwire -m c
which generates a report.
Then update your database as needed from the twr file that was generated in /var/lib/tripwire/report/<filename>.twr
with
# tripwire -m u --twrfile /var/lib/tripwire/report/<filename>.twr
see
www.whitehats.com and
www.sans.org reading room.