Snoop servlet not running in web sphere application server

Hi,
        I have problem running Snoop servlet in websphere application server on AS/400. We have a v4r4 m/c. When I run the snoop in IE, I get a blank screen and i found the following exceptions in the Error-Log.

[December 6, 1999 2:00:29 PM GMT+00:00] WebSphere Exception
[December 6, 1999 2:00:29 PM GMT+00:00] START EXCEPTION BLOCK
[December 6, 1999 2:00:29 PM GMT+00:00] java.lang.NullPointerException
java.lang.NullPointerException
      com/ibm/servlet/engine/SEConnectionHandler.createServiceHandler()Lcom/ibm/servlet/engine/SEConnectionHandler;+3 (SEConnectionHandler.java:108)

      com/ibm/servlet/engine/SEEngine.service(Lcom/ibm/servlet/engine/api/IAppServerConnection;)V+95 (SEEngine.java:308)

      com/ibm/servlet/engine/api/ServerEntry.service(Lcom/ibm/servlet/engine/api/IServerRequestConnection;)I+89 (ServerEntry.java:201)

      com/ibm/servlet/engine/nativeEntry/NativeServerEntry.service(JJILjava/lang/String;Ljava/lang/String;)I+48 (NativeServerEntry.java:144)

[December 6, 1999 2:00:29 PM GMT+00:00] END EXCEPTION BLOCK
[December 6, 1999 2:00:29 PM GMT+00:00] WebSphere Exception
[December 6, 1999 2:00:29 PM GMT+00:00] START EXCEPTION BLOCK
[December 6, 1999 2:00:29 PM GMT+00:00] java.lang.NullPointerException
java.lang.NullPointerException
      com/ibm/servlet/engine/SEEngine.service(Lcom/ibm/servlet/engine/api/IAppServerConnection;)V+144 (SEEngine.java:327)

      com/ibm/servlet/engine/api/ServerEntry.service(Lcom/ibm/servlet/engine/api/IServerRequestConnection;)I+89 (ServerEntry.java:201)

      com/ibm/servlet/engine/nativeEntry/NativeServerEntry.service(JJILjava/lang/String;Ljava/lang/String;)I+48 (NativeServerEntry.java:144)

[December 6, 1999 2:00:29 PM GMT+00:00] END EXCEPTION BLOCK

Can any of u tell me what would have gone wrong.. Because it was working fine last week. Due to this problem I am unable to test my servlets even though it is successfully loaded in the application server..

Thanks in advance,
Regards,
Gururaj