ServiceBus QueueClient crashes

Hi

I am trying to access my SB queue named ifslabscustomer_ifsapplicationsqueue using a WorkerRole in the cloud but getting the following exception:

A first chance exception of type 'System.ServiceModel.FaultException`1' occurred in Microsoft.ServiceBus.dll
A first chance exception of type 'System.TimeoutException' occurred in Microsoft.ServiceBus.dll

I have a standard implementation as follows:

public override bool OnStart()
        {
            // Set the maximum number of concurrent connections 
            ServicePointManager.DefaultConnectionLimit = 12;

            // Create the queue if it does not exist already
            string connectionString = CloudConfigurationManager.GetSetting("ServiceBusQueueConnectionString");
            string queueName = CloudConfigurationManager.GetSetting("ServiceBusQueueName");

            var namespaceManager = NamespaceManager.CreateFromConnectionString(connectionString);
            if (!namespaceManager.QueueExists(queueName))
            {
                namespaceManager.CreateQueue(queueName);
            }

            // Initialize the connection to Service Bus Queue
            Client = QueueClient.CreateFromConnectionString(connectionString, queueName);
            return base.OnStart();
        }

 public override void Run()
        {
            Client.OnMessage((receivedMessage) =>
                {

Trace.WriteLine("Received message");

                }

            CompletedEvent.WaitOne();
        }