Trying to validate a new field

formulariocliente.php

<?php
/**
* 2007-2020 PrestaShop
*
* NOTICE OF LICENSE
*
* This source file is subject to the Academic Free License (AFL 3.0)
* that is bundled with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://opensource.org/licenses/afl-3.0.php
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@prestashop.com so we can send you a copy immediately.
*
* DISCLAIMER
*
* Do not edit or add to this file if you wish to upgrade PrestaShop to newer
* versions in the future. If you wish to customize PrestaShop for your
* needs please refer to http://www.prestashop.com for more information.
*
*  @author    PrestaShop SA <contact@prestashop.com>
*  @copyright 2007-2020 PrestaShop SA
*  @license   http://opensource.org/licenses/afl-3.0.php  Academic Free License (AFL 3.0)
*  International Registered Trademark & Property of PrestaShop SA
*/

if (!defined('_PS_VERSION_')) {
    exit;
}

class FormularioCliente extends Module
{

    public function __construct()
    {
        $this->name = 'formulariocliente';
        $this->tab = 'checkout';
        $this->version = '1.0.0';
        $this->author = 'Javier Isaac Velásquez Venegas';
        $this->need_instance = 0;

        /**
         * Set $this->bootstrap to true if your module is compliant with bootstrap (PrestaShop 1.6)
         */
        $this->bootstrap = true;

        parent::__construct();

        $this->displayName = $this->l('formulariocliente');
        $this->description = $this->l('Se agrega los campos de identificación y el cuadro seleccionado');

        $this->confirmUninstall = $this->l('¿Estas seguro de querer desinstalar el módulo?');

        $this->ps_versions_compliancy = array('min' => '1.7', 'max' => _PS_VERSION_);
    }

    /**
     * Don't forget to create update methods if needed:
     * http://doc.prestashop.com/display/PS16/Enabling+the+Auto-Update
     */
    public function install()
    {

        include(dirname(__FILE__).'/sql/install.php');

        return parent::install() &&
            $this->registerHook('additionalCustomerFormFields') &&
            $this->registerHook('actionObjectCustomerAddAfter') &&
            $this->registerHook('actionObjectCustomerUpdateAfter') &&
            $this->registerHook('validateCustomerFormFields');
    }

    public function uninstall()
    {
        include(dirname(__FILE__).'/sql/uninstall.php');

        return parent::uninstall();
    }

    public function hookAdditionalCustomerFormFields($params)
    {
        $documentos = $this->listarTipoDocumento();

        $format = [
            'tipodocumento' => (new FormField())
                ->setName('tipodocumento')
                ->setType('select')
                ->setRequired(true)
                ->setLabel($this->l('Tipo de Documento')),
            'documento' => (new FormField())
                ->setName('documento')
                ->setType('text')
                ->setRequired(true)
                ->setLabel($this->l('Documento')),
            
        ];

        foreach ($documentos as $documento) {
            $format['tipodocumento']->addAvailableValue(
                $documento['id_tipodocumento'],
                $documento['descripcion']
            );
        }

        if (isset($params['cookie']->id_customer)) {
            $documento = Db::getInstance()->getValue(
                'select `documento` from `' . _DB_PREFIX_. 'documentocliente` where id_customer = '
                . (int) $params['cookie']->id_customer
            );
            $tipodocumento = Db::getInstance()->getValue(
                'select `id_tipodocumento` from `' . _DB_PREFIX_. 'documentocliente` where id_customer = '
                . (int) $params['cookie']->id_customer
            );
            $format['documento']->setValue($documento);
            $format['tipodocumento']->setValue($tipodocumento);
        }

        $position = (int) array_search('email', array_keys($params['fields']), null) + 1;

        $fieldcount = count($params['fields']);

        $result = array_merge(
            array_slice($params['fields'], 0, $position),
            $format,
            array_slice($params['fields'], $position - $fieldcount)
        );

        $params['fields'] = $result;
    }

    public function hookActionObjectCustomerAddAfter($params)
    {
        /* Place your code here. */
        $this->actualizarDocumento($params);
    }

    public function hookValidateCustomerFormFields($params)
    {
        foreach ($params['fields'] as $field) {
            if ($field->getName() == 'documento') {
                $field->setErrors(array($this->l('Test Error')));   
            }
        }
        return $params['fields'];
    }

    public function hookActionObjectCustomerUpdateAfter($params)
    {
        /* Place your code here. */
        $this->actualizarDocumento($params);
    }

    private function actualizarDocumento($params)
    {
        $idCliente = $params['object']->id;
        $tipodocumento = Tools::getValue('tipodocumento');
        $documento = Tools::getValue('documento');
        return Db::getInstance()->insert(
            'documentocliente',
            [
                'documento' => pSQL($documento),
                'id_tipodocumento' => (int) $tipodocumento,
                'id_customer' => (int) $idCliente,
            ],
            false,
            true,
            Db::REPLACE
        );
    }
    private function listarTipoDocumento()
    {
        return Db::getInstance()->executeS('select `id_tipodocumento`, `descripcion` from `' . _DB_PREFIX_. 'tipodocumento`');
    }

    private function obtenerDocumento($idCliente)
    {
        return Db::getInstance()->getValue(
            'select `documento` from `' . _DB_PREFIX_. 'documentocliente` where id_customer = '
            . (int) $idCliente
        );
    }
}