java client calling on a CORBA Server

dear all,
I am trying to connect to a CORBA server using java.
The IDL file is
***********************IDL FILE***************************************
module SA
{
   struct outLSMSResp
   {
      string TN;
      string LRN;
      string LSMS_STATUS;
      string SERVICE_PROVIDER_ID;
      string ACTIVATION_DATE;
      string PORT_TYPE;
      string OLD_NPA;
      string NPAC_ID;
      string DOWNLOAD_REASON;
      string POOL_INDICATOR;
      string DONOR_SPID;
      string POOL_ALLOCATION_SPID;
      string POOL_ACTIVATION_TIME;
      string POOL_LRN;
   };

   struct inTNQuery
   {
      string USERID;
      string SYSTEM_NAME;
      string TN;
   };

   struct NameValuePair
   {
      string name;
      string value;
   };
   
   typedef outLSMSResp LSMSResp;
   typedef inTNQuery TNQuery;
   typedef sequence<NameValuePair> GenericParam;

   interface LSMS
   {
      long getLSMSData(in TNQuery TNInfo, out LSMSResp LSMSInfo);
      long SyncServiceRequest(in GenericParam Request,
                              out GenericParam Response);
   };
};

************************************************************

client java file is
**********************JAVA CLIENT FILE*****************************************
//This will import the files you generated from the IDL.
import SA.*;
//Import the Java classes for file I/O.
import java.io.*;

public class ClientSA {
  public static void main(String[] args) {
    //A variable to hold the IOR in.
    String ior = null;

    //First, we need to read in the IOR from a file (this is probably the
    //hardest part of the program!!). Reading in ANY file in Java is
    //ALWAYS a bitch...
    try {
      //Open the file for reading:
      BufferedReader reader =
        new BufferedReader(new FileReader("ns.ior"));

      //Read the first line which is the IOR and save it to the 'ior' variable.
      //variable:
      ior = reader.readLine();

      //Be nice and close the file:
      reader.close();



    //We need to create our own ORB that will then connect to the CORBA
    //server at the EBI:
    org.omg.CORBA.ORB orb = org.omg.CORBA.ORB.init(args, null);

    //Use the IOR to connect to the EBI CORBA server and return a CORBA
    //object:
    org.omg.CORBA.Object object = orb.string_to_object(ior);

    //Convert this CORBA object to the SecretMessage object that it actually is on the
    //CORBA server at the EBI:
    LSMS bioSequenceServer = LSMSHelper.narrow(object);

    } catch (Exception ex) {
          //There was a problem with reading the file - Bomb out.
          ex.printStackTrace();
          System.exit(0);
    }
  }
}
//End of program




**********************JAVA CLIENT FILE*****************************************



I am getting the following error when i run the client

org.omg.CORBA.BAD_PARAM:   vmcid: 0x0  minor code: 0  completed: No
        at SA.LSMSHelper.narrow(LSMSHelper.java:60)
        at ClientSA.main(ClientSA.java:38)


has anybody come across this . i Googled but didnt get much info.

thanks in advance

Kiran
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