Type definition error: [simple type, class com.miaoshaproject.controller.viewobject.ItemVO]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class com.miaoshaproject.controller.viewobject.ItemVO and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: com.miaoshaproject.response.CommonReturnType["data"])]