springbootthymeleaf 페이지 반환 문자열을 렌더링하지 않음

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This application has no explicit mapping for /error, so you are seeing this as a fallback.

Sat Mar 30 01:59:07 CST 2019

There was an unexpected error (type=Internal Server Error, status=500).

Error resolving template [index], template might not exist or might not be accessible by any of the configured Template Resolvers

org.thymeleaf.exceptions.TemplateInputException: Error resolving template [index], template might not exist or might not be accessible by any of the configured Template Resolvers

@RestController 및 @Controller