failed to req API:http://pigx-register:8848/nacos/v1/ns/instance. code:500 msg: java.net.ConnectExce

错误信息：failed to req API:/nacos/v1/ns/instance after all servers([pigx-register:8848]) tried: failed to req API:http://pigx-register:8848/nacos/v1/ns/instance. code:500 msg: java.net.ConnectException: Connection refused: connect
出错原因：activemq未启动。
解决方案：启动activemq.bat文件。