error setting "dubbo.protocol.port" in appplication.yml

[vince7839]

OS: win10 64
IDE: IDEA-2019.1
I have set a property in appplication.yml like this:
dubbo:
protocol:
port: 20880
and exception throws,

java.lang.IllegalStateException: Invalid name="org.apache.dubbo.config.ProtocolConfig#0" contains illegal character, only digit, letter, '-', '_' or '.' is legal.
at org.apache.dubbo.config.utils.ConfigValidationUtils.checkProperty(ConfigValidationUtils.java:592) ~[dubbo-2.7.8.jar:2.7.8]
at org.apache.dubbo.config.utils.ConfigValidationUtils.checkName(ConfigValidationUtils.java:548) ~[dubbo-2.7.8.jar:2.7.8]
at org.apache.dubbo.config.utils.ConfigValidationUtils.validateProtocolConfig(ConfigValidationUtils.java:436) ~[dubbo-2.7.8.jar:2.7.8]
at org.apache.dubbo.config.utils.ConfigValidationUtils.validateServiceConfig(ConfigValidationUtils.java:330) ~[dubbo-2.7.8.jar:2.7.8]
at org.apache.dubbo.config.ServiceConfig.checkAndUpdateSubConfigs(ServiceConfig.java:283) ~[dubbo-2.7.8.jar:2.7.8]
at org.apache.dubbo.config.ServiceConfig.export(ServiceConfig.java:193) ~[dubbo-2.7.8.jar:2.7.8]
at com.alibaba.cloud.dubbo.service.DubboMetadataServiceExporter.export(DubboMetadataServiceExporter.java:82) ~[spring-cloud-starter-dubbo-2.2.6.RELEASE.jar:2.2.6.RELEASE]
at com.alibaba.cloud.dubbo.metadata.repository.DubboServiceMetadataRepository.getDubboMetadataServiceMetadata(DubboServiceMetadataRepository.java:288) ~[spring-cloud-starter-dubbo-2.2.6.RELEASE.jar:2.2.6.RELEASE]
at com.alibaba.cloud.dubbo.autoconfigure.DubboServiceRegistrationAutoConfiguration.attachDubboMetadataServiceMetadata(DubboServiceRegistrationAutoConfiguration.java:173) ~[spring-cloud-starter-dubbo-2.2.6.RELEASE.jar:2.2.6.RELEASE]
at com.alibaba.cloud.dubbo.autoconfigure.DubboServiceRegistrationAutoConfiguration.attachDubboMetadataServiceMetadata(DubboServiceRegistrationAutoConfiguration.java:167) ~[spring-cloud-starter-dubbo-2.2.6.RELEASE.jar:2.2.6.RELEASE]
at com.alibaba.cloud.dubbo.autoconfigure.DubboServiceRegistrationAutoConfiguration.onServiceInstancePreRegistered(DubboServiceRegistrationAutoConfiguration.java:149) ~[spring-cloud-starter-dubbo-2.2.6.RELEASE.jar:2.2.6.RELEASE]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_181]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_181]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_181]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_181]
at org.springframework.context.event.ApplicationListenerMethodAdapter.doInvoke(ApplicationListenerMethodAdapter.java:305) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.context.event.ApplicationListenerMethodAdapter.processEvent(ApplicationListenerMethodAdapter.java:190) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.context.event.ApplicationListenerMethodAdapter.onApplicationEvent(ApplicationListenerMethodAdapter.java:153) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:403) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:360) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at com.alibaba.cloud.dubbo.registry.DubboServiceRegistrationEventPublishingAspect.beforeRegister(DubboServiceRegistrationEventPublishingAspect.java:57) ~[spring-cloud-starter-dubbo-2.2.6.RELEASE.jar:2.2.6.RELEASE]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_181]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_181]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_181]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_181]
at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:644) ~[spring-aop-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:626) ~[spring-aop-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.aop.aspectj.AspectJMethodBeforeAdvice.before(AspectJMethodBeforeAdvice.java:44) ~[spring-aop-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:55) ~[spring-aop-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:175) ~[spring-aop-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:747) ~[spring-aop-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.aop.aspectj.AspectJAfterAdvice.invoke(AspectJAfterAdvice.java:47) ~[spring-aop-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:175) ~[spring-aop-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:747) ~[spring-aop-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:93) ~[spring-aop-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:747) ~[spring-aop-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:689) ~[spring-aop-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at com.alibaba.cloud.nacos.registry.NacosServiceRegistry$$EnhancerBySpringCGLIB$$bf419c95.register() ~[spring-cloud-starter-alibaba-nacos-discovery-2.2.6.RELEASE.jar:2.2.6.RELEASE]
at com.alibaba.cloud.dubbo.autoconfigure.DubboServiceRegistrationNonWebApplicationAutoConfiguration.register(DubboServiceRegistrationNonWebApplicationAutoConfiguration.java:97) ~[spring-cloud-starter-dubbo-2.2.6.RELEASE.jar:2.2.6.RELEASE]
at com.alibaba.cloud.dubbo.autoconfigure.DubboServiceRegistrationNonWebApplicationAutoConfiguration.onApplicationStarted(DubboServiceRegistrationNonWebApplicationAutoConfiguration.java:90) ~[spring-cloud-starter-dubbo-2.2.6.RELEASE.jar:2.2.6.RELEASE]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_181]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_181]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_181]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_181]
at org.springframework.context.event.ApplicationListenerMethodAdapter.doInvoke(ApplicationListenerMethodAdapter.java:305) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.context.event.ApplicationListenerMethodAdapter.processEvent(ApplicationListenerMethodAdapter.java:190) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.context.event.ApplicationListenerMethodAdapter.onApplicationEvent(ApplicationListenerMethodAdapter.java:153) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:403) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:360) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.boot.context.event.EventPublishingRunListener.started(EventPublishingRunListener.java:98) ~[spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
at org.springframework.boot.SpringApplicationRunListeners.started(SpringApplicationRunListeners.java:71) ~[spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:321) [spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
at com.example.ssologinservice.SsoLoginServiceApplication.main(SsoLoginServiceApplication.java:12) [classes/:na]

[AlbumenJ]

This might the issue of Spring Cloud Alibaba.