我将SpringBoot用作Kafka的使用者，该程序接受来自Kafka的消息，但日志中包含以下信息
[kafka-producer-network-thread | producer-2] WARN org.apache.kafka.clients.NetworkClient - [Producer clientId=producer-2] Connection to node -1 could not be established. Broker may not be available.
请帮助我解决这个问题