org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.IllegalArgumentException: No converter found for return value of type: class com.navercorp.yobi.controllers.api.CodeController$$Lambda$33/1309738228

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org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.IllegalArgumentException: No converter found for return value of type: class com.navercorp.yobi.controllers.api.CodeController$$Lambda$33/1309738228
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:982)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:618)

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