ERROR Failed to send requests for topics xyz with correlation ids in [0,12] (kafka.producer.async.DefaultEventHandler:97)
Exception in thread "main" kafka.common.FailedToSendMessageException: Failed to send messages after 3 tries.
    at kafka.producer.async.DefaultEventHandler.handle(DefaultEventHandler.scala:91)
    at kafka.producer.Producer.send(Producer.scala:77)
    at kafka.javaapi.producer.Producer.send(Producer.scala:33)
    at kafkaprod.HelloKafkaProducer.main(HelloKafkaProducer.java:26)

我的所有producer api程序都出现了这个错误，我试图解决它，但是我找不到问题所在。
请帮帮我。
提前谢谢。