received the value 'exchange_dlx' of type 'longstr' but current is none,

错误: received the value 'exchange_dlx' of type 'longstr' but current is none,

原因：queue已经存在，但是启动时试图设定一个 x-dead-letter-exchange 参数，这和服务器上的定义不一样，server 不允许所以报错。

解决方案：删除 queue 重新 declare 则不会有问题。