No provider available for the service

This is my running environment：
2.3.7.RELEASE
2.2.6.RELEASE
Hoxton.SR9

When I started the service, I found the following error log. What is the reason？？

```
2021-11-09 17:50:15.903 service-patient [ main ] - [ ERROR ] [ com.alibaba.cloud.dubbo.service.DubboMetadataServiceInvocationHandler : 53 ] - Failed to invoke the method $invoke in the service org.apache.dubbo.rpc.service.GenericService. No provider available for the service service-project/com.alibaba.cloud.dubbo.service.DubboMetadataService:1.0.0 from registry 192.168.0.217:8848 on the consumer 192.168.0.143 using the dubbo version 2.7.8. Please check if the providers have been started and registered.
org.apache.dubbo.rpc.RpcException: Failed to invoke the method $invoke in the service org.apache.dubbo.rpc.service.GenericService. No provider available for the service service-project/com.alibaba.cloud.dubbo.service.DubboMetadataService:1.0.0 from registry 192.168.0.217:8848 on the consumer 192.168.0.143 using the dubbo version 2.7.8. Please check if the providers have been started and registered.
at org.apache.dubbo.rpc.cluster.support.AbstractClusterInvoker.checkInvokers(AbstractClusterInvoker.java:283)
at org.apache.dubbo.rpc.cluster.support.FailoverClusterInvoker.doInvoke(FailoverClusterInvoker.java:59)
at org.apache.dubbo.rpc.cluster.support.AbstractClusterInvoker.invoke(AbstractClusterInvoker.java:260)
at org.apache.dubbo.rpc.cluster.interceptor.ClusterInterceptor.intercept(ClusterInterceptor.java:47)
at org.apache.dubbo.rpc.cluster.support.wrapper.AbstractCluster$InterceptorInvokerNode.invoke(AbstractCluster.java:92)
at org.apache.dubbo.rpc.cluster.support.wrapper.MockClusterInvoker.invoke(MockClusterInvoker.java:88)
at org.apache.dubbo.rpc.cluster.support.registry.ZoneAwareClusterInvoker.doInvoke(ZoneAwareClusterInvoker.java:91)
at org.apache.dubbo.rpc.cluster.support.AbstractClusterInvoker.invoke(AbstractClusterInvoker.java:260)
at org.apache.dubbo.rpc.cluster.interceptor.ClusterInterceptor.intercept(ClusterInterceptor.java:47)
at org.apache.dubbo.rpc.cluster.support.wrapper.AbstractCluster$InterceptorInvokerNode.invoke(AbstractCluster.java:92)

```