错误信息：

com.alibaba.dubbo.rpc.RpcException: Failed to invoke the method getUserOnlineInfo in the service com.ikang.comuser.service.api.AccountService. Tried 1 times of the providers [10.200.2.126:20880] (1/4) from the registry zookeeper1.daoyitong.com:2181 on the consumer 10.200.2.123 using the dubbo version 2.8.4. Last error is: Failed to invoke remote method: getUserOnlineInfo, provider: dubbo://10.200.2.126:20880/com.ikang.comuser.service.api.AccountService?accesslog=true&anyhost=true&application=pavo-rest-web&check=false&default.accesslog=true&default.check=false&default.delay=-1&default.loadbalance=random&default.retries=0&default.timeout=30000&delay=-1&dubbo=2.8.4&generic=false&interface=com.ikang.comuser.service.api.AccountService&logger=slf4j&methods=checkPhone,isLogin4Doctor,validateCaptchaJieMian,register4RegistrationScene,logout,getDauLoginUser,getLastLoginUsers,getLoginUsers,userLogout,registerByWeChat,updateForgetPassword,getUserInfosByUserIds,getAccountByLoginName,getUserInfoWithAiKangToken,adminLogin,registerActivated,bindUserWithToken,modifyPhoneFedex,modifyPasswordByPhone,isAdminAccessAllowed,loginAsUserDoctor,loginActivated,queryUserInfo,freeLogin,getOnlineInfo,register4Admin,modifyLoginType,register4Registration,login,isLogin,isAccessAllowed,getContinuousLoginUser,refereshCacheWithUserOnline,getLastLoginUser,updateAccountInfo,smsLogin,smsABCLogin,getAdminOnlineInfo,updatePassword,countActiveUser,getUserOnlineInfo,checkUsername,getAccountResources,updateAccountAvatar,getAccountByIdNum,updateUserInForStep,modifyPhoneByUserId,insertThirdUser,quickLogin,unifyRegisterLogin,saveUserInfo,getPhoneByOpenIdAndChannel,getAccountByPhone,getCaptcha,adminLogout,validateCaptcha,register&pid=12947&revision=2.0.7&side=consumer×tamp=1629961843891&version=1.0.0, cause: message can not send, because channel is closed . url:dubbo://10.200.2.126:20880/com.ikang.comuser.service.api.CustomLogService2?accesslog=true&anyhost=true&application=pavo-rest-web&check=false&codec=dubbo&default.accesslog=true&default.check=false&default.delay=-1&default.loadbalance=random&default.retries=0&default.timeout=30000&delay=-1&dubbo=2.8.4&generic=false&heartbeat=60000&interface=com.ikang.comuser.service.api.CustomLogService&logger=slf4j&methods=getCustomServiceLog,updateCustomServiceLog,insertServiceLog,getCustomTypes&pid=12947&revision=2.0.7&side=consumer×tamp=1629961847372&version=1.0.0