I get an exception (Error: 500) when trying to run the rpcrouter, why ?

[ERIKSSON,TOBIAS (A-Sweden,ex1)]

Hi
 I get the error message below in my broser when I try to call the rpcrouter
from the webpage, but why? what can I do to solve this?

/Tobias



Error: 500
Location: /soap/servlet/rpcrouter
Internal Servlet Error:

java.lang.NullPointerException
        at java.util.Hashtable.put(Hashtable.java)
        at org.apache.tomcat.core.Context.setAttribute(Context.java:411)
        at
org.apache.tomcat.facade.ServletContextFacade.setAttribute(ServletContextFac
ade.java:116)
        at
org.apache.soap.server.http.ServerHTTPUtils.setServletClassLoaderIntoContext
(ServerHTTPUtils.java:144)
        at
org.apache.soap.server.http.RPCRouterServlet.init(RPCRouterServlet.java:173)
        at javax.servlet.GenericServlet.init(GenericServlet.java:258)
        at
org.apache.tomcat.core.ServletWrapper.doInit(ServletWrapper.java:317)
        at org.apache.tomcat.core.Handler.init(Handler.java:215)
        at
org.apache.tomcat.core.ServletWrapper.init(ServletWrapper.java:296)
        at org.apache.tomcat.core.Handler.service(Handler.java:254)
        at
org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
        at
org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:81
2)
        at
org.apache.tomcat.core.ContextManager.service(ContextManager.java:758)
        at
org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpC
onnectionHandler.java:213)
        at
org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
        at
org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:501)
        at java.lang.Thread.run(Thread.java)