Populate() Mongoose is not returning joined data - node.js

Question

Well, I´am trying to retrieve Name and Lastname from user who created the document but it´s not working, it still returning Mongo´s Id
This is my areas model
var mongo = require('mongoose'),
validator = require('mongoose-unique-validator'),
Schema = mongo.Schema
var model = new Schema({
NAME: { type: String, required: true, unique: true, max: 50, min: 3 },
STATUS: { type: String, default: 'active' },
ADDED_BY: { type: Schema.Types.ObjectId, ref: 'users' },
ADDED_DATE: { type: Date, default: Date.now }
}, {collection :'areas'})
model.plugin( validator, { message: 'The {PATH} is not valid or duplicated' } )
module.exports = mongo.model('Area', model )
This is the user model
var mongo = require('mongoose'),
validator = require('mongoose-unique-validator'),
Schema = mongo.Schema
var userSchema = new Schema({
PERSONAL_DATA: {
NAME: { type: String, required: [ true, 'The name is necessary' ], max: 50 },
LAST_NAME: { type: String, required: [ true, 'the lastname is necessary' ], max: 100 },
PHOTO: { type: String, max: 100 },
BIRTHDAY: { type: Date },
MARITIAL_STATUS: { type: Schema.Types.ObjectId, ref: 'maritial_statuses' },
GENDER: { type: String, max: 1 },
EMAIL: { type: String, required: true },
},
COMPANY_DATA: {
JOB: { type: Schema.Types.ObjectId, ref: 'jobs' },
AREA: { type: Schema.Types.ObjectId, ref: 'areas' },
ROLE: { type: Schema.Types.ObjectId, ref: 'roles' },
BOSS: { type: Schema.Types.ObjectId, ref: 'users' },
}
}, { collection: 'users' } )
model.plugin( validator, { message: 'The {PATH} is not valid or duplicated' } )
module.exports = mongo.model('User', userSchema )
And this is my areas route
var express = require('express'),
model = require('../../models/catalogs/areas'),
app = express()
app.get('/:from', (req, res) => {
var from = parseInt( req.params.from )
model.find()
.sort('NAME').populate({ path: 'users', select: 'NAME LAST_NAME'})
.limit(10).skip(from)
.exec((error, data) => {
if (error) {
return res.status(500).json({
success: false,
error
})
}
res.status(200).json({
success: true,
data
})
})
})
module.exports = app
The response is
{
"success": true,
"data": [
{
"STATUS": "active",
"_id": "5c547f4adadf433914f72c8c",
"NAME": "Contabilidad y Finanzas",
"ADDED_BY": "5c4f562deec6f4defeea759b",
"ADDED_DATE": "2019-02-01T17:18:02.680Z",
"__v": 0
},
{
"STATUS": "active",
"_id": "5c547f3edadf433914f72c8b",
"NAME": "Tecnologías",
"ADDED_BY": "5c4f562deec6f4defeea759b",
"ADDED_DATE": "2019-02-01T17:17:50.579Z",
"__v": 0
}
]
}
As you seen, ADDED_BY is a field joined to Users and I want to retrieve that information. I don´t know what is wrong with my code.