Installing LC ES 8.0 trial - ReaderExtensions error

Hello!
I installed LiveCycle ES 8.0 with JBoss service. Everything works fine when I try http://localhost:8080/adminui and http://localhost:8080/workspace, but when I try http://localhost:8080/ReaderExtensions I get an error in my web browser, a null pointer exception: http://img88.imageshack.us/img88/7081/errorreaderextensionsxx2.jpg

It's running on Tomcat 5.5, JDK 1.5.0.11. Win XP SP2, Core2Duo, 2GB RAM.

Someone can help me?

Thanks in advance.