problem with jboss startguide tutorial (dukes bank app)

I follwed exactly the tutorial about deployng the ear file from dukes
bank source.
At the end the ear is done, it deploy without error but when i try to
access the lochalhost:8080/bank/main i recive a page blank and the
jboss console show

11:52:38,369 INFO  [EARDeployer] Started J2EE application:
file:/E:/jboss-4.0.0/server/vanoserver/deploy/JBossDukesBank.ear

11:52:57,426 ERROR [Engine] ApplicationDispatcher[/bank]
Servlet.service() for servlet jsp threw exception
org.apache.jasper.JasperException: /logon2.jsp(1,1) The absolute uri:
http://java.sun.com/jsp/jstl/core cannot be resolved in e
ither web.xml or the jar files deployed with this application


11:52:57,436 WARN  [FormAuthenticator] Unexpected error forwarding to
login page
org.apache.jasper.JasperException: /logon2.jsp(1,1) The absolute uri:
http://java.sun.com/jsp/jstl/core cannot be resolved in e
ither web.xml or

Can you help me to understand what is the problem?
tnk