我正在编写一个使用Ribbon的应用程序，我有如下错误：
2017-07-22 19:05:22.742 WARN 9907 --- [nio-8091-exec-8] com.netflix.loadbalancer.RoundRobinRule : No up servers available from load balancer: DynamicServerListLoadBalancer:{NFLoadBalancer:name=reservationManagement,current list of Servers=[<MY_IP>:8090, <MY_IP>:8082],Load balancer stats=Zone stats: {defaultzone=[Zone:defaultzone; Instance count:2; Active connections count: 0; Circuit breaker tripped count: 0; Active connections per server: 0.0;]
},Server stats: [[Server:<MY_IP>:8090; Zone:defaultZone; Total Requests:0; Successive connection failure:0; Total blackout seconds:0; Last connection made:Thu Jan 01 01:00:00 CET 1970; First connection made: Thu Jan 01 01:00:00 CET 1970; Active Connections:0; total failure count in last (1000) msecs:0; average resp time:0.0; 90 percentile resp time:0.0; 95 percentile resp time:0.0; min resp time:0.0; max resp time:0.0; stddev resp time:0.0]
, [Server:<MY_IP>:8082; Zone:defaultZone; Total Requests:0; Successive connection failure:0; Total blackout seconds:0; Last connection made:Thu Jan 01 01:00:00 CET 1970; First connection made: Thu Jan 01 01:00:00 CET 1970; Active Connections:0; total failure count in last (1000) msecs:0; average resp time:0.0; 90 percentile resp time:0.0; 95 percentile resp time:0.0; min resp time:0.0; max resp time:0.0; stddev resp time:0.0]
]}ServerList:org.springframework.cloud.netflix.ribbon.eureka.DomainExtractingServerList@54b38e96
2017-07-22 19:05:22.744 ERROR 9907 --- [nio-8091-exec-8] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.IllegalStateException: No instances available for reservationManagement] with root cause
java.lang.IllegalStateException: No instances available for reservationManagement
at org.springframework.cloud.netflix.ribbon.RibbonLoadBalancerClient.execut
为什么Ribbon表示在“当前服务器列表”中打印时没有reservationManagement实例，其中有两个（这是真的）？
我很感激你的答案！
PS。这些应用程序在Eureka中也可见，当我使用Zuul服务器时，它运行良好。