突然拉不到数据了！！！！求助

the task-14's errors are:
Worker is dead on 11.239.175.23:6900,20160708224323, at 2016-07-08 22:43:26
Worker is dead on 11.239.175.23:6900,20160708224343, at 2016-07-08 22:43:46
Task-14 is dead on 11.239.175.23:6900, 20160708224349, at 2016-07-08 22:43:49
the task-15's errors are:
java.lang.RuntimeException: com.alibaba.rocketmq.client.exception.MQClientException: The consumer group[taobao] has been created before, specify another name please.
See https://github.com/alibaba/RocketMQ/issues/40 for further details.
    at com.alibaba.middleware.race.jstorm.RaceSpout.open(RaceSpout.java:75)
    at com.alibaba.jstorm.task.execute.spout.SpoutExecutors.init(SpoutExecutors.java:142)
    at com.alibaba.jstorm.task.execute.spout.MultipleThreadSpoutExecutors.init(MultipleThreadSpoutExecutors.java:64)
    at com.alibaba.jstorm.task.execute.BaseExecutors.initWrapper(BaseExecutors.java:154)
    at com.alibaba.jstorm.task.execute.spout.MultipleThreadSpoutExecutors.run(MultipleThreadSpoutExecutors.java:76)
    at com.alibaba.jstorm.callback.AsyncLoopRunnable.run(AsyncLoopRunnable.java:95)
    at java.lang.Thread.run(Thread.java:756)
Caused by: com.alibaba.rocketmq.client.exception.MQClientException: The consumer group[taobao] has been created before, specify another name please.