Error: Connection strategy not found at MongoStore 这是connect-mongo版本的问题

使用connect-mongo时候出现如下错误

Error:
Connection strategy not found at MongoStore

 

var
MongoStore =
require('connect-mongo')(session);

new MongoStore({
// db: settings.db,
// host: settings.host,
// port: settings.port
url:'mongodb://localhost/blog'
})