MQRC_OBJECT_ALREADY_EXISTS blunder formula 2100

I am Using IBM WebSphere MQ. Whenever coexisting users record in to a IBM
MQ, when a second user comes and try to opening a getqueue they accept
2100 0x00000834 MQRC_OBJECT_ALREADY_EXISTS error. Kindly yield some
suggestion.Connect to MQ Manager:mqQueueManager = new
MQQueueManager(mqQueueManagerName);Open Put Queue:mqPutQueue =
mqQueueManager.AccessQueue(mqRequestQueueName, MQC.MQOO_INQUIRE |
MQC.MQOO_OUTPUT | MQC.MQOO_FAIL_IF_QUIESCING);Opening a ReplyTo Queue
generates a blunder when a second user tries to connect. The First user's
enterprising reserve will be deleted when they disconnect. That Second
user is amateurish to connect, until a initial user closes a
application:mqGetQueue = mqQueueManager.AccessQueue(mqModelQueueName,
MQC.MQOO_INPUT_SHARED , mqQueueManagerName, mqReplyQueueName, "");