0:40초 부근에 models/index.js 부분처럼 하자마자 에러가 나는데

comment.js

module.exports = (sequelize, DataTypes) => {
  const Comment = sequelize.define(
    'Comment',
    {
      content: {
        type: DataTypes.TEXT, // 긴 글
        allowNull: false,
      },
    },
    {
      charset: 'utf8mb4',
      collate: 'utf8mb4_general_ci',
    },
  );
  Comment.associate = (db) => {
    db.Comment.belongsTo(db.User);
    db.Comment.belongsTo(db.Post);
  };
  return Comment;
};

user.js

module.exports = (sequelize, DataTypes) => {
  const User = sequelize.define(
    'User',
    {
      nickname: {
        type: DataTypes.STRING(20),
        allowNull: false,
      },
      userId: {
        type: DataTypes.STRING(20),
        allowNull: false,
        unique: true,
      },
      password: {
        type: DataTypes.STRING(100),
        allowNull: false,
      },
    },
    {
      charset: 'utf8',
      collate: 'utf8_general_ci',
    },
  );

  User.associate = (db) => {
    db.User.hasMany(db.Post, { as: 'Posts' });
    db.User.hasMany(db.comment);
    db.User.belongsToMany(db.Post, { through: 'Like', as: 'Liked' });
    db.User.belongsToMany(db.User, { through: 'Follow', as: 'Follwers', foreignKey: 'followingId' });
    db.User.belongsToMany(db.User, { through: 'Follow', as: 'Followings', foreignKey: 'followerId' });
  };
  return User;
};

index.js

const Sequelize = require('sequelize');
const env = process.env.NODE_ENV || 'development';
const config = require('../config/config')[env];
const db = {};

const sequelize = new Sequelize(config.database, config.username, config.password, config);

db.Commnet = require('./comment')(sequelize, Sequelize);
db.Hashtag = require('./hashtag')(sequelize, Sequelize);
db.Image = require('./image')(sequelize, Sequelize);
db.Post = require('./post')(sequelize, Sequelize);
db.User = require('./user')(sequelize, Sequelize);
Object.keys(db).forEach((modelName) => {
  if (db[modelName].associate) {
    db[modelName].associate(db);
  }
});
db.sequelize = sequelize;
db.Sequelize = Sequelize;

module.exports = db;