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This can happen when the Kafka client is unable to connect to the Kafka broker or when the broker is not properly configured. The error can also occur when there is a network connectivity issue between the client and the broker, or when the broker is not running. To resolve the error, you can try restarting the broker, checking the network connectivity, and verifying that the Kafka client has the correct configuration to connect to the broker. It may also be helpful to check the Kafka server logs for any errors or warnings that could indicate a problem with the broker.