hot deployment problem when using EJB3 preview 5 and JBoss 4

[opapo]

I am running Windows XP
I am using JBoss 4.0.1 SP1
I am using EJB 3.0 Preview 5
I am running the code for the stateful beans that comes with Preview 5
If I deploy when the server is off the code will run
If I re-deploy or hot deploy the code produces errors

This is the order I do things:
1. Install JBoss 4.0.1 SP1
2. Install EJB 3.0 Preview 5
3. Navigate to tutorial for stateful beans
4. Execute command

ant

5. Navigate to JBOSS_HOME
6. Execute command

run -c all

7. Navigate back to stateful tutorial folder
-Note- I use two screens so I switch screens
8. Execute command

ant run

9. I get this:

C:\Projects\Eclipse\Copy of Maverick-3.0\MaverickWeb>ant run
Buildfile: build.xml

prepare:

compile:

ejbjar:

run:
 [java] log4j:WARN No appenders could be found for logger (org.jboss.remotin
g.Client).
 [java] log4j:WARN Please initialize the log4j system properly.
 [java] Buying 1 memory stick
 [java] Buying another memory stick
 [java] Buying a laptop
 [java] Print cart:
 [java] 2 Memory stick
 [java] 1 Laptop
 [java] Checkout
 [java] Should throw an object not found exception by invoking on cart after
 @Remove method
 [java] Successfully caught no such object exception.

10. Execute command

ant clean

11. Execute command

ant run

12. I get this:

C:\Projects\Eclipse\Copy of Maverick-3.0\MaverickWeb>ant run
Buildfile: build.xml

prepare:
 [mkdir] Created dir: C:\Projects\Eclipse\Copy of Maverick-3.0\MaverickWeb\bu
ild
 [mkdir] Created dir: C:\Projects\Eclipse\Copy of Maverick-3.0\MaverickWeb\bu
ild\classes

compile:
 [javac] Compiling 3 source files to C:\Projects\Eclipse\Copy of Maverick-3.0
\MaverickWeb\build\classes

ejbjar:
 [jar] Building jar: C:\Projects\Eclipse\Copy of Maverick-3.0\MaverickWeb\b
uild\tutorial.ejb3
 [copy] Copying 1 file to C:\Extracted\JBoss\jboss-4.0.1sp1\server\all\deplo
y

run:
 [java] Exception in thread "main" javax.naming.NameNotFoundException: org.j
boss.tutorial.stateful.bean.ShoppingCart not bound
 [java] at org.jnp.server.NamingServer.getBinding(NamingServer.java:491)

 [java] at org.jnp.server.NamingServer.getBinding(NamingServer.java:499)

 [java] at org.jnp.server.NamingServer.getObject(NamingServer.java:505)
 [java] at org.jnp.server.NamingServer.lookup(NamingServer.java:278)
 [java] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 [java] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAcces
sorImpl.java:39)
 [java] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMet
hodAccessorImpl.java:25)
 [java] at java.lang.reflect.Method.invoke(Method.java:585)
 [java] at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.jav
a:294)
 [java] at sun.rmi.transport.Transport$1.run(Transport.java:153)
 [java] at java.security.AccessController.doPrivileged(Native Method)
 [java] at sun.rmi.transport.Transport.serviceCall(Transport.java:149)
 [java] at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTranspor
t.java:460)
 [java] at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPT
ransport.java:701)
 [java] at java.lang.Thread.run(Thread.java:595)
 [java] at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServe
r(StreamRemoteCall.java:247)
 [java] at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCa
ll.java:223)
 [java] at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:126)
 [java] at org.jnp.server.NamingServer_Stub.lookup(Unknown Source)
 [java] at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:54
4)
 [java] at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:52
0)
 [java] at javax.naming.InitialContext.lookup(InitialContext.java:351)
 [java] at org.jboss.tutorial.stateful.client.Client.main(Client.java:29
)
 [java] Java Result: 1

My question is why is this a problem?