javax.xml.rpc.JAXRPCException???????

[asadfx]

I have deployed a simple web service using Apache Tomcat 6.0 and Axis 1.4 in Windows XP. Now the server is very simple:

import java.io.*;
import java.util.*;

/*
HelloWorld.java
This is our web service
*/
public class HelloWorld
{
public String getHelloWorld(String id)
{
String retName="";

try
		{
			File indexFile = new File("index.txt");
			retName=indexFile.getAbsolutePath()+id;
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
	return retName;
}
}

Now if the client doesn't send any parameters then everything works well. But as sson as I try to send a parameter to the server, I get the following error:

"javax.xml.rpc.JAXRPCException: Number of parameters passed in (0) doesn't match the number of IN/INOUT parameters (1) from the addParameter() calls"

Why is this happening??? My client is also very simple:

package dummyC;
import java.util.*;
import org.apache.axis.client.Call;
import org.apache.axis.client.Service;
import org.apache.axis.encoding.XMLType;
import org.apache.axis.utils.Options;
import javax.xml.namespace.QName;
import javax.xml.rpc.ParameterMode;
import javax.xml.rpc.*;

public class DummyC {

	/**
	 * @param args
	 */
	public static void main(String[] args) 
	{
		try
		{
		
		Service service = new Service();
		Call call = (Call)service.createCall();
		String endpoint ="http://localhost:8081/axis/HelloWorld.jws";
		call.setTargetEndpointAddress(new java.net.URL(endpoint));
		call.setOperationName(new QName("getHelloWorld"));

		call.addParameter("param1",XMLType.XSD_STRING, ParameterMode.IN);
		String output = (String)call.invoke(new Object[]{});
		System.out.println("Got result : " + output);
		}
		catch(Exception e)
		{
			System.out.print("sssss: "+e.toString());
		}
		
				
	}

}

Please guys, I need to solve this problem with in the next couple of days.

Bye.