我并没有转换result类型，但在返回result时，报类型强转错误。java.lang.ClassCastException: com.example.girl.domain.Result cannot be cast to com.example.girl.domain.Girl

@PostMapping(value = "/addGirl")
public Result<Girl> girlAdd(@Valid Girl girl, BindingResult bindingResult) {
   Result result = new Result();
   if(bindingResult.hasErrors()) {
       result.setCode("1");
       result.setMsg(bindingResult.getFieldError().getDefaultMessage());
       //result.setData(null);
   } else {
       girl.setCupSize(girl.getCupSize());
       girl.setAge(girl.getAge());
       result.setCode("0");
       result.setMsg("添加成功");
       result.setData(girlRepository.save(girl));
   }
   return result;