Error Installing Jboss Server

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Hi,

I am trying to install Jboss application server on linux. When I ran sh
run.sh from Jboss Bin Directory, It gave me the following
messages/Errors.

JBoss Bootstrap Environment

JBOSS_HOME: /home/cabig/jboss-4.0.2

JAVA: /usr/java/j2sdk1.4.2_11/bin/java

JAVA_OPTS: -server -Xms128m -Xmx128m -Dprogram.name=run.sh

CLASSPATH:
/home/cabig/jboss-4.0.2/bin/run.jar:/usr/java/j2sdk1.4.2_11/lib/tools.jar

=========================================================================

Failed to boot JBoss:
java.lang.ClassNotFoundException: org.jboss.system.server.ServerImpl
at java.net.URLClassLoader$1.run(URLClassLoader.java:199)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at
org.jboss.system.server.ServerLoader.createServer(ServerLoader.java:271)
at
org.jboss.system.server.ServerLoader.load(ServerLoader.java:253)
at org.jboss.Main.boot(Main.java:187)
at org.jboss.Main$1.run(Main.java:463)
at java.lang.Thread.run(Thread.java:534)

Kindly let me know what the error is ? How to solve this ?

Appreciate your Help,

Thanks
shan