func (s *UserServer) CreateUser(c context.Context, req *proto.CreateUserInfo) (*proto.UserInfoResponse, error){
var user model.User
   result := DB.Where(&model.User{Mobile: req.Mobile}).First(&user)
if result.Error != nil {
return nil, result.Error
   }

if result.RowsAffected != 0 {
return nil, status.Errorf(codes.AlreadyExists,"用户已存在")
   }


   user.Mobile = req.Mobile
   user.NickName = req.NickName

   options := &password.Options{16,100,32,sha512.New}
   salt, encodePwd := password.Encode(req.Password,options)
   user.Password = fmt.Sprintf("$pbkdf2-sha512$%s$%s",salt,encodePwd)


   result = DB.Create(&user)

if result.Error != nil {
return nil, status.Errorf(codes.Internal,result.Error.Error())
   }

   userInfoRsp := ModelToResponse(user)

return &userInfoRsp, nil
}

老师好，我测试添加用户服务时这里报了一个错误：panic: rpc error: code = Unknown desc = record not found。

我执行代码过程中报错了，我尝试了在Server端的代码里打印错误，也没打印出来，我又把打印的代码删掉了