Node made a mistake when operating gridfs and asked for an answer.

  node.js, question

Exceptions:MongoError: cannot establish topology capabilities as driver is still in process of connecting

var mongodb = require('mongodb');
var db = new mongodb.Db('image_test', new mongodb.Server('127.0.0.1', 27017));

var ImageDB = {
    'save_image': function(img, callback){
        var gs = new mongodb.GridStore(db, name, 'w',{
            'content_type' : img.mimetype
        });
        gs.open(function(err, gs){
            gs.write(img.buffer, function(){
                gs.close(function(err, result){
                    if(err){
                        console.log(err);
                    }else{
                        console.log(result);
                    }
                });
            });
        });
    },
}

May I know what this means? I just learned node today.

It has been settled. . . The original also need to open it first. . . We’ll study it tomorrow.