After I installed tripwire, also established Policy Document.But the use of the database directive "tripwire - init" when an error.
Code:
### Error:File could not be opend for writing.
### Filename:/etc/tripwire/lib/tripwire/sever.one.twd
### No such file or directory
### Exiting...

Who can help me？I do not know why I did not have sever.one.twd file.

Welcome to LQ. Please don't mark threads "solved" unless they are.
Re-read your configuration file and ensure the /etc/tripwire/lib/tripwire/ directory exists and if that would be the most logical place to write the database. When you first initialize tripwire in needs to fill its database with entries to check so that may be the reason for this warning. After your first initialization run check if the /etc/tripwire/lib/tripwire/sever.one.twd file exists and if it has got entries corresponding to your configuration. If you're unsure how to check then consult the tripwire man page because I don't know: I favor Samhain over AIDE or Open Source tripwire which was last updated in 2011 BTW.

Thank you, I will try.

Database generation success is my path setting error. I am very grateful for your help