SEVERE Error listenerStart

[Emilio Recio]

Hi, i have installed Debian and Tomcat 5.5.26. I need  install Archiva 
1.2.1 as Web App.
I config Tomcat like official site 
http://cwiki.apache.org/confluence/display/ARCHIVA/Archiva+on+Tomcat
The dif in my archiva.xml are:

<Context path="/archiva"
        docBase="${catalina.base}/archiva-webapp-1.0-SNAPSHOT.war">
 <Resource name="jdbc/users"
           auth="Container"
           type="javax.sql.DataSource"
           username="sa"
           password=""
           driverClassName="org.apache.derby.jdbc.EmbeddedDriver"
           
url="jdbc:derby:/usr/share/tomcat5.5/database/users;create=true" />

 <Resource name="jdbc/archiva"
           auth="Container"
           type="javax.sql.DataSource"
           username="sa"
           password=""
           driverClassName="org.apache.derby.jdbc.EmbeddedDriver"
           
url="jdbc:derby:/usr/share/tomcat5.5/database/archiva;create=true" />

 <Resource name="mail/Session"
           auth="Container"
           type="javax.mail.Session"
           mail.smtp.host="localhost"/>
</Context>

When i restart Tomcat it oks, but in catalina.out has the next errors:
   SEVERE Error listenerStart
   SEVERE: Context [/archiva] startup failed due to previous errors
and the http://localhost:8180/archiva has the next 404 error:
_    The requested resource () is not available._


I need your help! :-)
Thanks!