How to add a new features and use yaml config to configuration?

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I create a new features, and write yaml to parse yaml file.

also add META-INFO.services

org.apache.shardingsphere.infra.yaml.config.swapper.rule.YamlDataNodeRuleConfigurationSwapper
org.apache.shardingsphere.infra.yaml.config.swapper.rule.YamlREuleConfigurationSwapper

But when I run Proxy, get an error:

Caused by: org.yaml.snakeyaml.error.YAMLException: Invalid tag:

I implements YamlRuleConfigurationSwapper, getRuleTagName and getOrder getTypeClass.
and write unittest to test yaml parse success.

Have something needed add in proxy?