connection error: { MongoNetworkError: failed to connect to server [localhost:27017] on first connect [MongoError: Server at localhost:27017 reports maximum wire version 0, but this version of the Node.js Driver requires at least 2 (MongoDB 2.6)]
MongoDB Server 2.4.x: mongoose ^3.8 or 4.x
MongoDB Server 2.6.x: mongoose ^3.8.8 or 4.x
MongoDB Server 3.0.x: mongoose ^3.8.22, 4.x, or 5.x
MongoDB Server 3.2.x: mongoose ^4.3.0 or 5.x
MongoDB Server 3.4.x: mongoose ^4.7.3 or 5.x
MongoDB Server 3.6.x: mongoose 5.x
MongoDB Server 4.0.x: mongoose ^5.2.0
mongodb version 版本错误