我收到以下错误:在sequelize中没有有效的属性定义

const { Sequelize, DataTypes } = require('sequelize');
const sequelize = new Sequelize('database', 'username', 'password', {
  host: 'localhost',
  dialect: 'mysql'
});

const User = sequelize.define('User', {
  firstName: {
    type: DataTypes.STRING,
    allowNull: false
  },
  lastName: {
    type: DataTypes.STRING,
    allowNull: false
  },
  age: {
    type: DataTypes.INTEGER,
    allowNull: false
  }
});

// 同步模型到数据库
User.sync()
  .then(() => {
    console.log('模型同步成功');
  })
  .catch((error) => {
    console.error('模型同步失败:', error);
  });