我试图将sequelize orm添加到我的EMPTY项目中，并出现问题。我要做的第一件事是express-generator创建空项目，接下来我写npm install --save sequelize和npm install --save pg pg-hstore。然后，在新生成的文件中，我只添加一行require('sequelize');，并收到错误：
e:\nodeproj\node_modules\sequelize\lib\utils\validator-extras.js:78
validator.extend(key, extend);
^
TypeError: Object has no method 'extend'
at module.exports.extensions (e:\nodeproj\node_modules\sequelize\lib\utils\validator-extras.js:78:13)
at e:\nodeproj\node_modules\sequelize\node_modules\lodash\lodash.js:4040:15
at baseForOwn (e:\nodeproj\node_modules\sequelize\node_modules\lodash\lodash.js:2573:24)
at e:\nodeproj\node_modules\sequelize\node_modules\lodash\lodash.js:4009:18
at Function.forEach (e:\nodeproj\node_modules\sequelize\node_modules\lodash\lodash.js:7634:11)
at Object.<anonymous> (e:\nodeproj\node_modules\sequelize\lib\utils\validator-extras.js:77:3)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:364:17)
at require (module.js:380:17)
at Object.<anonymous> (e:\nodeproj\node_modules\sequelize\lib\instance-validator.js:3:17)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
我尝试过不同的版本，但效果相同。提前谢谢！
UPD：
package.json文件：
{
"name": "nodeproj",
"version": "0.0.0",
"private": true,
"scripts": {
"start": "node ./bin/www"
},
"dependencies": {
"body-parser": "~1.13.2",
"cookie-parser": "~1.3.5",
"debug": "~2.2.0",
"express": "~4.13.1",
"jade": "~1.11.0",
"morgan": "~1.6.1",
"node-sass-middleware": "0.8.0",
"serve-favicon": "~2.3.0",
"sequelize": "~3.20.0",
"pg-hstore": "~2.3.2",
"pg": "~4.5.1"
}
}