PIX515E report_ no data in admin report and traffic

I'm doing a 30days PIX515E logs, all looks good except several reports contain no data.

1. admin report no data

I found it was count into Error message.
Top Event Messages
Top messages generated with Critical severity
Message Host # Events
%PIX-2-109011: Authen Session Start: user 'cahe', sid 156120 0.0.0.0 2
%PIX-2-109011: Authen Session Start: user 'rhg', sid 156112 0.0.0.0 2
%PIX-2-109011: Authen Session Start: user 'jgu', sid 156074 0.0.0.0
PIX is doing AAA authentication for certain inbound access.

2. traffic report no data
There is no data on Mbyte

Is there anywhere a PIX configure guide/best practice to better feed the Firewall Analyzer?

thanks,
fraser