Error 404 for the home page...

Hi,

I'm a newbie with JAHIA. After my first install into a Linux workstation
and TOMCAT, I've got the error bellow about the home page. Any idea?
-------------------------
Your Jahia Server has generated an error. Please review the details
below for additional information: 
Severity : ERROR

Error : 404 Not found - Page:1, 404 error - page [1] could not be found
in the database or is no longer accessible.

URL : http://localhost:8080/jahia/Jahia/engineName/logout/op/edit/pid/1
Method : GET

Remote host : localhost Remote Address : 127.0.0.1

Request headers : 
host:localhost:8080
user-agent:Mozilla/5.0 (X11; U; Linux i686; fr; rv:1.6) Gecko/20040115
accept:text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,te
xt/plain;q=0.8,image/png,image/jpeg,image/gif;q=0.2,*/*;q=0.1
accept-language:fr,en;q=0.5
accept-encoding:gzip,deflate
accept-charset:ISO-8859-1,utf-8;q=0.7,*;q=0.7
keep-alive:300
connection:keep-alive
referer:http://localhost:8080/jahia/Jahia/pid/1/op/edit
cookie:JSESSIONID=1B69DD2F725AA1FC50A7095F5C9D57EC;
JSESSIONID=F5F45DC5765344871EEFC2EDAC666CBB;
sympa_altemails=patrick.gelin%40rpn.ch%3Aldap%266dc43abd

Depending on the severity of this error, Jahia may still be operational
or not. Please check your installation as soon as possible.

Patrick Gelin