Problem putting msg on Remote Queue of Websphere MQ

using System;
using IBM.WMQ;
 
public class MQSample1
{
    private String qManager = "QMQB01"; //define name of queue
    //manager to connect to.
    private MQQueueManager qMgr;  //define a queue manager object
 
    static void Main(string[] args)
    {
        new MQSample1();
    }
    public MQSample1()
    {
        try
        {
 
 
 
            //Create a connection to the queue manager
            qMgr = new MQQueueManager(qManager);
 
            //Set up the options on the queue we wish to open...
            //Note.All WebSphere MQ Options are prefixed with MQC
            int openOptions = MQC.MQOO_INPUT_AS_Q_DEF | MQC.MQOO_OUTPUT;
 
            //Now specify the queue that we wish to open,
            //and the open options...
            MQQueue system_default_local_queue = qMgr.AccessQueue("Q.QB01.SEP.MAQS.002.S1", openOptions);
            
            //Define a simple WebSphere MQ message,and write some text in UTF format..
            MQMessage hello_world = new MQMessage();
            hello_world.WriteUTF("Hello World!");
 
            //specify the message options...
            MQPutMessageOptions pmo = new MQPutMessageOptions(); //accept the defaults,
 
            //same as MQPMO_DEFAULT
            //put the message on the queue
            system_default_local_queue.Put(hello_world, pmo);
 
            //get the message back again...
            //First define a WebSphere MQ message buffer to receive the message into..
            MQMessage retrievedMessage = new MQMessage();
            retrievedMessage.MessageId = hello_world.MessageId;
            
            //Set the get message options...
            MQGetMessageOptions gmo = new MQGetMessageOptions(); //accept the defaults
            //same as MQGMO_DEFAULT
 
            //get the message off the queue...
            system_default_local_queue.Get(retrievedMessage, gmo);
            //And prove we have the message by displaying the UTF message text
            String msgText = retrievedMessage.ReadUTF();
            Console.WriteLine("The message is:" + msgText);
            //Close the queue...
            system_default_local_queue.Close();
            //Disconnect from the queue manager
            qMgr.Disconnect();
        }
        //If an error has occurred in the above,try to identify what went wrong
 
        //Was it a WebSphere MQ error?
        catch (MQException ex)
        {
            Console.WriteLine("A WebSphere MQ error occurred :Completion code " +
            ex.CompletionCode + "Reason code " + ex.ReasonCode);
        }
        //Was it a System error?
        catch (System.Exception ex)
        {
            Console.WriteLine("A System error occurred:" + ex);
        }
    }
}