java.lang.NoClassDefFoundError

Hi experts, I get this error when I try to execute a java file. Thanks

D:\DS\dsSoapLab>java gmit.CalcClient
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/axis/utils
/Options
        at gmit.CalcClient.main(CalcClient.java:12)

the java file:
package gmit;

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.rpc.ParameterMode;

public class CalcClient{
      public static void main(String [] args) throws Exception{
            Options options = new Options(args);

            String endpoint = "http://localhost:8080/axis/Calculator.jws";

            // Do argument checking
             args = options.getRemainingArgs();

             if (args == null || args.length != 3){
                  System.err.println("Usage: CalcClient <add|subtract arg1 arg2");
                 return;
             }

             String method = args[0];
             if (!(method.equals("add") || method.equals("subtract"))) {
                  System.err.println("Usage: CalcClient <add|subtract arg1 arg2");
                  return;
             }

            // Make the call
             Integer i1 = new Integer(args[1]);
             Integer i2 = new Integer(args[2]);

             Service service = new Service();
             Call call = (Call) service.createCall();

        call.setTargetEndpointAddress(new java.net.URL(endpoint));
        call.setOperationName( method );
        call.addParameter("op1", XMLType.XSD_INT, ParameterMode.IN);
        call.addParameter("op2", XMLType.XSD_INT, ParameterMode.IN);
        call.setReturnType(XMLType.XSD_INT);

        Integer ret = (Integer) call.invoke( new Object [] { i1, i2 });

        System.out.println("Got result : " + ret);
      }
}