Error message when starting eXist client

Recently I have started getting the following error message when I log in via the Java webstart client. Does anybone know what I can do to fix this?

[root@media-1 exist]# bin/startup.sh

Using locale: en_US.UTF-8

WARN: The following JAR file entries from 'org/exist/start/start.config' aren't available (this may NOT be a problem):
    /opt/exist/tools/ircbot/dist/ircbot.jar

Configuring eXist from /opt/exist/conf.xml
23 Jun 2009 20:58:23,075 [main] INFO  (FileResource.java [<clinit>]:60) - Checking Resource aliases
23 Jun 2009 20:58:23,183 [main] INFO  (HttpServer.java [setStatsOn]:1130) - Statistics on = false for org.mortbay.jetty.Server@778255
23 Jun 2009 20:58:23,187 [main] INFO  (HttpServer.java [doStart]:684) - Version Jetty/5.1.12
23 Jun 2009 20:58:23,497 [main] INFO  (Container.java [start]:74) - Started org.mortbay.jetty.servlet.WebApplicationHandler@fe315d
Logging already initialized. Skipping...
23 Jun 2009 20:58:24,133 [main] INFO  (Container.java [start]:74) - Started WebApplicationContext[/exist,eXist XML Database]
23 Jun 2009 20:58:24,137 [main] INFO  (SocketListener.java [start]:205) - Started SocketListener on 0.0.0.0:8080
23 Jun 2009 20:58:24,137 [main] INFO  (Container.java [start]:74) - Started org.mortbay.jetty.Server@778255
-----------------------------------------------------
Server has started on port 8080. Configured contexts:
http://localhost:8080/exist
-----------------------------------------------------
23 Jun 2009 20:58:29,142 [P1-9] WARN  (ServletHandler.java [handle]:577) - EXCEPTION  
javax.servlet.ServletException: An error occurred: null
        at org.exist.webstart.JnlpServlet.doGet(JnlpServlet.java:112)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:743)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
        at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:428)
        at org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:473)
        at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:568)
        at org.mortbay.http.HttpContext.handle(HttpContext.java:1530)
        at org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:633)
        at org.mortbay.http.HttpContext.handle(HttpContext.java:1482)
        at org.mortbay.http.HttpServer.service(HttpServer.java:909)
        at org.mortbay.http.HttpConnection.service(HttpConnection.java:820)
        at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:986)
        at org.mortbay.http.HttpConnection.handle(HttpConnection.java:837)
        at org.mortbay.http.SocketListener.handleConnection(SocketListener.java:245)
        at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:357)
        at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534)


Kind Regards

Swami Kevala