Which version of Portal ?
Did you install core-admin ?
Thank you very much, Thomas.
The version of Portal is 2.4.1
The version of JBoss is 4.0.5.GA
I don't understand very well what you meant by installing core-admin (I'm a newbie to both JBoss and Portal). I installed the bundle JBoss App Server + Portal.
core-admin is for 2.6 (so not an issue for you)
You probably have a stack trace giving you more details in the console and server/default/logs/server.log
If you look at it, you may have a clue on what's wrong.