如何修复 MongoDB 中的“加载导航时出错：服务器实例池被破坏”错误

Question

我已经用port 27017在localhost上打开了 mongodb ...我插入产品和元素....它正在工作.... 10 分钟后...在 MongoDB 指南针的 GUI 上我有这个错误：'加载导航时发生错误：服务器实例池被破坏'...

我正在使用月光，快递，nodejs

var createError = require('http-errors');
var express = require('express');
var expressHbs = require('express-handlebars');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var mongo = require('mongoose');
let session = require('express-session');
let flash = require('connect-flash');
let validator = require('express-validator');
let bodyParser = require('body-parser');
let csrf = require('csurf');

var indexRouter = require('./routes/index');
var usersRouter = require('./routes/user');

// Declare the DB URI
const DATABASE_URI =
  process.env.DATABASE_URI || 'mongodb://localhost:27017/shopping'

// Connect to DB
mongo.connect(DATABASE_URI, { useNewUrlParser: true, useUnifiedTopology: true }).then(
  () => {
    console.log('MongoDB connected…')
  },
  err => {
    console.log(err)
  }
)

var app = express();

// view engine setup
app.engine(
  "hbs",
  expressHbs({
    extname: "hbs",
    defaultLayout: "layout",
    layoutsDir: "views/layouts/"
  })
);

app.set('view engine', '.hbs');

app.use(logger('dev'));
app.use(bodyParser.urlencoded({ extended: false }))
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(validator());
app.use(cookieParser());
app.use(session({secret: 'mysupersecret', resave: false, saveUninitialized: false}));
app.use(flash());
app.use(express.static(path.join(__dirname, 'public')));
app.use(csrf())

app.use('/user', usersRouter);
app.use('/', indexRouter);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;

在网站上...我有 db 的元素...但我在 MongoDB GUI 上看不到它们