使用你的版本，nacos-config.txt 中配置错误

报错 no available service 'null' found, please make sure registry config correct
查看源码之后， 在 interface RegistryService 中 String PREFIX_SERVICE_MAPPING = "vgroupMapping."；
所以需要将 nacos-config.txt 中 vgroup_mapping修改为 vgroupMappig 实测通过

Start with nacos-config.txt and compare its service-mapping key with RegistryService.PREFIX_SERVICE_MAPPING. Correct the configuration key to match the constant, then verify the sample configuration no longer produces the “no available service 'null' found” error.

Written by the indexing model from the issue text.