node.js - Why am I getting the error Cannot read properties of undefined (reading 'findOne') when trying to add

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I'm working with a Node.js application using MongoDB and Mongoose, and I have two models: User and Address. I am trying to add an address to a user, but when I try to call findOne on the Address model, I get the following error:

TypeError: Cannot read properties of undefined (reading 'findOne')
    at C:\path\to\my\project\routes\addresses.js:76:41
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)

Error Explanation: I am trying to use Address.findOne({ user }) to find the user's address. If the user doesn't have an address, I create a new Address document. However, I am getting the error Cannot read properties of undefined (reading 'findOne'), which suggests that Address is not properly defined or imported.

const express = require('express');
const { Address } = require('../models/address'); // Correct import of the Address model
const router = express.Router();

router.post('/', async (req, res) => {
    const { user, fullName, phone, addressLine1, addressLine2, city, state, zip, country, isDefault } = req.body;

    try {
        let userAddress = await Address.findOne({ user });

        if (!userAddress) {
            userAddress = new Address({
                user,
                addresses: [
                    { fullName, phone, addressLine1, addressLine2, city, state, zip, country, isDefault },
                ],
            });
        } else {
            if (isDefault) {
                userAddress.addresses.forEach((address) => (address.isDefault = false)); // Unset previous defaults
            }
            userAddress.addresses.push({ fullName, phone, addressLine1, addressLine2, city, state, zip, country, isDefault });
        }

        const savedAddress = await userAddress.save();
        res.status(200).json({ success: true, message: 'Address added successfully.', data: savedAddress });
    } catch (error) {
        console.error("Error during address creation:", error);
        return res.status(500).json({ success: false, message: 'Failed to create Address.', error: error.message });
    }
});

module.exports = router;

Models (address.js):

const mongoose = require('mongoose');

const addressSchema = new mongoose.Schema({
    user: { type: mongoose.Schema.Types.ObjectId, ref: 'User', required: true },
    addresses: [
        {
            fullName: String,
            phone: String,
            addressLine1: String,
            addressLine2: String,
            city: String,
            state: String,
            zip: String,
            country: String,
            isDefault: Boolean,
        },
    ],
});

const Address = mongoose.model('Address', addressSchema);

module.exports = { Address };

What I've tried so far: I have confirmed that the Address model is correctly imported in my addresses.js file. I have verified the schema of the Address model and ensured that the field user is properly referenced as ObjectId from the User model. I checked the database connection and confirmed that the database is connected.

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