channel error； protocol method: #method＜channel.close＞(reply-code=404, reply-text=NOT_FOUND - no

1、出现Error: {:plugins_not_found, [:“rabbitmq_delayed_message_exchange-3.9.0.ez“]}

或者 channel error; protocol method: #method(reply-code=404, reply-text=NOT_FOUND - no 等错误

2、原因是没有安装RabbitMQ delayed_message_exchange插件，这里没有x-delayed-message就是没安装。

3、最新版RabbitMQ delayed_message_exchange插件安装

地址：https://www.rabbitmq.com/community-plugins.html

4、下载 rabbitmq_delayed_message_exchange-3.9.0.ez 文件，复制到 plugins目录下

5、sbin  目录下执行rabbitmq-plugins enable rabbitmq_delayed_message_exchange

6、先关闭：rabbitmqctl stop 再重启：rabbitmq-server 

7、看到这里有x-delayed-message就成功