ItemType.phpファイルはリモートサーバー上にあがっております。
<?php

《ItemType.phpデータ》
/*
* This file is part of EC-CUBE
*
* Copyright(c) EC-CUBE CO.,LTD. All Rights Reserved.
*
* http://www.ec-cube.co.jp/
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/

namespace Eccube\Form\Type;

use Eccube\Common\EccubeConfig;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\Extension\Core\Type\TextType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\Options;
use Symfony\Component\OptionsResolver\OptionsResolver;
use Symfony\Component\Validator\Constraints as Assert;

/**
* Class PhoneNumberType
*/
class PhoneNumberType extends AbstractType
{
/**
* @var EccubeConfig
*/
protected $eccubeConfig;

/**
* PhoneNumberType constructor.
*
* @param EccubeConfig $eccubeConfig
*/
public function __construct(EccubeConfig $eccubeConfig)
{
$this->eccubeConfig = $eccubeConfig;
}

/**
* {@inheritdoc}
*/
public function buildForm(FormBuilderInterface $builder, array $options)
{
// 全角英数を事前に半角にする
$builder->addEventSubscriber(new \Eccube\Form\EventListener\ConvertKanaListener());
$builder->addEventSubscriber(new \Eccube\Form\EventListener\TruncateHyphenListener());
}

/**
* {@inheritdoc}
*/
public function configureOptions(OptionsResolver $resolver)
{
$eccubeConfig = $this->eccubeConfig;
$constraints = function (Options $options) use ($eccubeConfig) {
$constraints = [];
// requiredがtrueに指定されている場合, NotBlankを追加
if (isset($options['required']) && true === $options['required']) {
$constraints[] = new Assert\NotBlank();
}

$constraints[] = new Assert\Length([
'max' => $eccubeConfig['eccube_tel_len_max'],
]);

$constraints[] = new Assert\Type([
'type' => 'numeric',
'message' => 'form_error.numeric_only',
]);

return $constraints;
};

$resolver->setDefaults([
'options' => ['constraints' => []],
'constraints' => $constraints,
'attr' => [
'placeholder' => 'common.phone_number_sample',
],
'trim' => true,
]);
}

/**
* {@inheritdoc}
*/
public function getParent()
{
return TextType::class;
}

/**
* {@inheritdoc}
*/
public function getBlockPrefix()
{
return 'phone_number';
}
}



サーバーは変更せず、DNSの変更のみのドメイン変更です。
また移行時は移行前のサイトデータを、移行後のサイトに手入力でコピペしてやっており、なぜエラーが起きているのか状況が分からないです。