I am running the following code to insert fruit names into the database with Mongoose. It does insert the object but then it throws a TypeError: Unknown encoding: 1 and exits the script. I tried updating Mongoose and Mongo but it did not solve the problem.

var mongoose = require('mongoose');
var assert = require('assert');
var Fruits = require('./models/fruits-1');
var url = 'mongodb://localhost:27017/confusion';
mongoose.connect(url);
var db = mongoose.connection;
db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', function(){
    Fruits.create(
        {
            name: 'Apple',
            description: "It's delicious."
        }, function(err, fruit){
            if(err){
                console.log(err);
            }
            else{
                console.log(fruit);
            }
    });
});