Help for Aimeos

I think it's toArray and fromArray issue, so I did the follow things, but it still can't work.
First to add decorator for customer item at packages/cywextension/src/MShop/Customer/Item/Decorator/CywCustomerItemDecorator.php

namespace Aimeos\MShop\Customer\Item;

class CywCustomerItemDecorator ...

Hi There,
I followed this article https://aimeos.org/docs/latest/models/extend-managers/#easy-way to add new field to users,
First I created manager decorator at packages/cywextension/src/MShop/Customer/Manager/Decorator/CywCustomerDecorator.php
<?php
namespace Aimeos\MShop\Customer\Manager ...