스스로 해보기3(클라이언트/서버 비밀키 구분하기) 에러가 나서 문의 남깁니다.

터미널에서는 아래처럼 오류가 납니다.

sequelize deprecated Model.find has been deprecated, please use Model.findOne instead node_modules/sequelize/lib/model.js:4212:9
Executing (default): SELECT `id`, `host`, `type`, `clientSecret`, `frontSecret`, `createdAt`, `updatedAt`, `deletedAt`, `userId` FROM `domains` AS `domain` WHERE ((`domain`.`deletedAt` > '2019-02-24 14:06:19' OR `domain`.`deletedAt` IS NULL) AND `domain`.`host` = 'localhost:8003') LIMIT 1;
OPTIONS /v2/token 204 31.393 ms - 0
Executing (default): SELECT `id`, `host`, `type`, `clientSecret`, `frontSecret`, `createdAt`, `updatedAt`, `deletedAt`, `userId` FROM `domains` AS `domain` WHERE ((`domain`.`deletedAt` > '2019-02-24 14:06:19' OR `domain`.`deletedAt` IS NULL) AND `domain`.`host` = 'localhost:8003') LIMIT 1;
Executing (default): SELECT `id`, `host`, `type`, `clientSecret`, `frontSecret`, `createdAt`, `updatedAt`, `deletedAt`, `userId` FROM `domains` AS `domain` WHERE ((`domain`.`deletedAt` > '2019-02-24 14:06:19' OR `domain`.`deletedAt` IS NULL) AND `domain`.`host` = 'localhost:8003') LIMIT 1;
Executing (default): SELECT `domain`.`id`, `domain`.`host`, `domain`.`type`, `domain`.`clientSecret`, `domain`.`frontSecret`, `domain`.`createdAt`, `domain`.`updatedAt`, `domain`.`deletedAt`, `domain`.`userId`, `user`.`id` AS `user.id`, `user`.`email` AS `user.email`, `user`.`nick` AS `user.nick`, `user`.`password` AS `user.password`, `user`.`provider` AS `user.provider`, `user`.`snsId` AS `user.snsId`, `user`.`createdAt` AS `user.createdAt`, `user`.`updatedAt` AS `user.updatedAt`, `user`.`deletedAt` AS `user.deletedAt` FROM `domains` AS `domain` LEFT OUTER JOIN `users` AS `user` ON `domain`.`userId` = `user`.`id` AND (`user`.`deletedAt` > '2019-02-24 14:06:19' OR `user`.`deletedAt` IS NULL) WHERE ((`domain`.`deletedAt` > '2019-02-24 14:06:19' OR `domain`.`deletedAt` IS NULL) AND `domain`.`frontSecret` = NULL) LIMIT 1;
POST /v2/token 401 53.205 ms - 100

브라우저에서는 아래와 같이 나옵니다.

code: 401
message: "등록되지 않은 도메인입니다. 먼저 도메인을 등록하세요"

도메인은 등록 해놓았는데 이런 오류가 나와서 오타인지 3번 정도 체크해봤는데 그건 아닌거 같아서 질문드립니다.

router.post('/token', async (req, res) => {
    const { frontSecret } = req.body;
    try {
        const domain = await Domain.find({
            where: { frontSecret },
            include: {
                model: User,
                attribute: ['nick', 'id'],
            },
        });
        if (!domain) {
            return res.status(401).json({
                code: 401,
                message: '등록되지 않은 도메인입니다. 먼저 도메인을 등록하세요',
            });
        }
        const token = jwt.sign({
            id: domain.user.id,
            nick: domain.user.nick,
        }, process.env.JWT_SECRET, {
            expiresIn: '1m', // 1분
            issuer: 'nodebird',
        });
        return res.json({
            code: 200,
            message: '토큰이 발급되었습니다',
            token,
        });
    } catch (error) {
        console.error(error);
        return res.status(500).json({
            code: 500,
            message: '서버 에러',
        });
    }
});