老师，你好，我在这节运行时候报出下面错误

下面是代码：
router/blog.js

const {getList} = require('../controller/blog')
const { SuccessModel, ErrorModel } = require('../model/resModel')

const handleBlogRouter = (req,res)=> {

	const method = req.method //GET POST

	//获取博客列表
	if (method === 'GET' && req.path === '/api/blog/list') {

		const author =  req.query.author || ''
		const keyword = req.query.keyword || ''
		const listData = getList(author,keyword)

		//listData是请求返回的数据数组，我们还要设置返回的code和message信息，需要利用model进行数据格式的修整
		return new SuccessModel(listData)

	}

	//获取博客详情
	if(method === 'POST' && req.path === '/api/blog/detail'){

		return {
			msg : '这是获取博客详情的接口'
		}

	}

	//新建一篇博客
	if(method === 'POST' && req.path === '/api/blog/new'){

		return {
			msg : '这是新建博客详情的接口'
		}

	}

	//更新一篇博客
	if(method === 'POST' && req.path === '/api/blog/update'){

		return {
			msg : '这是更新博客详情的接口'
		}

	}

	//一篇博客
	if(method === 'POST' && req.path === '/api/blog/del'){

		return {
			msg : '这是删除一篇博客的接口'
		}
	}
}

module.exports = handleBlogRouter

model/resModel.js

/*
* @Author: yangyang
* @Date:   2019-07-30 08:59:02
* @Last Modified by:   yangyang
* @Last Modified time: 2019-07-30 08:59:02
*/
class BaseModel {
    constructor(data, message) {
    	//data是对象类型，message是字符串类型，如果第一个传入的就是字符串类型，第二个没传，要兼容，就把传入的字符串赋给message
        if (typeof data === 'string') {
            this.message = data
            data = null
            message = null
        }
        if (data) {
            this.data = data
        }
        if (message) {
            this.message = message
        }
    }
}

class SuccessModel extends BaseModel {
    constructor(data, message) {
        super(data, message)
        this.errno = 0
    }
}

class ErrorModel extends BaseModel {
    constructor(data, message) {
        super(data, message)
        this.errno = -1
    }
}

module.exports = {
    SuccessModel,
    ErrorModel
}

还有项目目录结构：

老师帮忙看下哪里有问题，麻烦老师了