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Hello. Immediately I apologize for my poor English.

I found an article on how to change the language change to change the multi store. my prestashop 1.7.7.1 But I have errors, who can help? or where to look?

article: https://www.prestashop.com/forums/topic/382956-multi-language-store-with-unique-domains-multistore-way/

i don't have override override\modules\ps_languageselector\ps_languageselector.php so i put everything in /modules/ps_languageselector/ps_languageselector.php 

this is how it looks

<?php

use PrestaShop\PrestaShop\Core\Module\WidgetInterface;

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

class Ps_LanguageselectorOverride extends Ps_Languageselector implements WidgetInterface
{

	public function install()
	{
		if (!parent::install() || !$this->registerHook('displayNav2'))
		  return false;
		return true;
	}

	public function getWidgetVariables($hookName = null, array $configuration = [])
	{
		$id_shop = (int)$this->context->shop->id;
		$id_group = (int)$this->context->shop->id_shop_group;
		$shop = new Shop($id_shop);
		$shopsList = $shop::getShops(false, $id_group);

		foreach ($shopsList as $index => $currShop) {
			$shopsList[$index]['lang'] = Language::getLanguages(true, $currShop['id_shop'])[0];
		}

		return array(
			'shopsGroup' => $shopsList,
			'currentShop' => $id_shop
		);
	}

	public function hookDisplaydisplayNav2($params)
	{
		$shopsList = $this->getWidgetVariables();

		if (1 < count($shopsList['shopsGroup'])) {
			$this->smarty->assign($shopsList);
			return $this->fetch('module:ps_languageselector/ps_languageselector.tpl');
    }

    return false;
	}

}

 themes\classic\modules\ps_languageselector\ps_languageselector.tpl

 <div id="mod-ps-languageselector">
  <h4>{l s='Language:' d='Shop.Theme.Global'}</h4>
  {if isset($shopsGroup)}
    {foreach from=$shopsGroup item=shop}
      <a href="http://{$shop.domain}" class="{if $shop.id_shop == $currentShop}active{/if}">
        {if isset($shop.lang.id_lang)}
          <img src="/img/l/{$shop.lang.id_lang}.jpg" alt="{$shop.lang.language_code}" title="{$shop.lang.name}" />
        {else}
          <img src="/img/l/none.jpg" alt="Flag no found">
        {/if}
      </a>
    {/foreach}
  {/if}
</div>

as in the article.

My mistake on the site.

(1/1) ClassNotFoundException
Attempted to load class "Ps_Languageselector" from the global namespace.
Did you forget a "use" statement?

in ps_languageselector.php line 32
at include_once()
in Module.php line 1149
at ModuleCore::coreLoadModule('ps_languageselector')
in Module.php line 1141
at ModuleCore::getInstanceByName('ps_languageselector')
in Hook.php line 904
at HookCore::exec('displayNav2', array('smarty' => object(SmartyDevTemplate), 'cookie' => object(Cookie), 'cart' => object(Cart)), null)
in smarty.config.inc.php line 167
at smartyHook(array('h' => 'displayNav2'), object(SmartyDevTemplate))
in SmartyLazyRegister.php line 83
at SmartyLazyRegister->__call('smartyHook', array(array('h' => 'displayNav2'), object(SmartyDevTemplate)))
in 6e578e133ed58d47a69ee7062b6bb5122428d6e7_2.file.header.tpl.php line 81
at Block_3343910586101ad15b33e87_53697865->callBlock(object(SmartyDevTemplate))
in smarty_internal_runtime_inheritance.php line 248
at Smarty_Internal_Runtime_Inheritance->callBlock(object(Block_3343910586101ad15b33e87_53697865), object(SmartyDevTemplate))
in smarty_internal_runtime_inheritance.php line 184
at Smarty_Internal_Runtime_Inheritance->process(object(SmartyDevTemplate), object(Block_3343910586101ad15b33e87_53697865))
in smarty_internal_runtime_inheritance.php line 156
at Smarty_Internal_Runtime_Inheritance->instanceBlock(object(SmartyDevTemplate), 'Block_3343910586101ad15b33e87_53697865', 'header_nav')
in 6e578e133ed58d47a69ee7062b6bb5122428d6e7_2.file.header.tpl.php line 31
at content_6101ad15b3f561_84992769(object(SmartyDevTemplate))
in smarty_template_resource_base.php line 123
at Smarty_Template_Resource_Base->getRenderedTemplateCode(object(SmartyDevTemplate))
in smarty_template_compiled.php line 114
at Smarty_Template_Compiled->render(object(SmartyDevTemplate))
in smarty_internal_template.php line 216
at Smarty_Internal_Template->render()
in smarty_internal_template.php line 385
at Smarty_Internal_Template->_subTemplateRender('file:_partials/header.tpl', null, 'classiclayouts/layout-full-width.tpl', 0, 31536000, array(), 0, false)
in e82d89c22dc120d03bf6a7f5543e8ff56fbae356_2.file.layout-both-columns.tpl.php line 188
at Block_12778859336101ad15ab2483_59246451->callBlock(object(SmartyDevTemplate))
in smarty_internal_runtime_inheritance.php line 248
at Smarty_Internal_Runtime_Inheritance->callBlock(object(Block_12778859336101ad15ab2483_59246451), object(SmartyDevTemplate))
in smarty_internal_runtime_inheritance.php line 184
at Smarty_Internal_Runtime_Inheritance->process(object(SmartyDevTemplate), object(Block_12778859336101ad15ab2483_59246451))
in smarty_internal_runtime_inheritance.php line 156
at Smarty_Internal_Runtime_Inheritance->instanceBlock(object(SmartyDevTemplate), 'Block_12778859336101ad15ab2483_59246451', 'header')
in e82d89c22dc120d03bf6a7f5543e8ff56fbae356_2.file.layout-both-columns.tpl.php line 62
at content_6101ad15ace019_67500863(object(SmartyDevTemplate))
in smarty_template_resource_base.php line 123
at Smarty_Template_Resource_Base->getRenderedTemplateCode(object(SmartyDevTemplate))
in smarty_template_compiled.php line 114
at Smarty_Template_Compiled->render(object(SmartyDevTemplate))
in smarty_internal_template.php line 216
at Smarty_Internal_Template->render()
in smarty_internal_template.php line 385
at Smarty_Internal_Template->_subTemplateRender('layouts/layout-both-columns.tpl', null, 'classiclayouts/layout-full-width.tpl', 0, 31536000, array(), 2, false, null, null)
in smarty_internal_runtime_inheritance.php line 116
at Smarty_Internal_Runtime_Inheritance->endChild(object(SmartyDevTemplate), 'layouts/layout-both-columns.tpl')
in d67279c1e8169c42112671b957277c41b71cf45f_2.file.layout-full-width.tpl.php line 42
at content_6101ad15a99ce2_15076725(object(SmartyDevTemplate))
in smarty_template_resource_base.php line 123
at Smarty_Template_Resource_Base->getRenderedTemplateCode(object(SmartyDevTemplate))
in smarty_template_compiled.php line 114
at Smarty_Template_Compiled->render(object(SmartyDevTemplate))
in smarty_internal_template.php line 216
at Smarty_Internal_Template->render()
in smarty_internal_template.php line 385
at Smarty_Internal_Template->_subTemplateRender('layouts/layout-full-width.tpl', null, 'classiclayouts/layout-full-width.tpl', 0, 31536000, array(), 2, false, null, null)
in smarty_internal_runtime_inheritance.php line 116
at Smarty_Internal_Runtime_Inheritance->endChild(object(SmartyDevTemplate), 'layouts/layout-full-width.tpl')
in 10ad1afad3da53f0c9d3801b0f1ca9b3acdb797c_2.file.page.tpl.php line 33
at content_6101ad15a87000_96927155(object(SmartyDevTemplate))
in smarty_template_resource_base.php line 123
at Smarty_Template_Resource_Base->getRenderedTemplateCode(object(SmartyDevTemplate))
in smarty_template_compiled.php line 114
at Smarty_Template_Compiled->render(object(SmartyDevTemplate))
in smarty_internal_template.php line 216
at Smarty_Internal_Template->render()
in smarty_internal_template.php line 385
at Smarty_Internal_Template->_subTemplateRender('page.tpl', null, 'classiclayouts/layout-full-width.tpl', 0, 31536000, array(), 2, false, null, null)
in smarty_internal_runtime_inheritance.php line 116
at Smarty_Internal_Runtime_Inheritance->endChild(object(SmartyDevTemplate), 'page.tpl')
in 8b9e5a7b8263849536862e2cbe12fc8157224ed3_2.file.index.tpl.php line 33
at content_6101ad15a2fa48_41477484(object(SmartyDevTemplate))
in smarty_template_resource_base.php line 123
at Smarty_Template_Resource_Base->getRenderedTemplateCode(object(SmartyDevTemplate))
in smarty_template_compiled.php line 114
at Smarty_Template_Compiled->render(object(SmartyDevTemplate))
in smarty_internal_template.php line 216
at Smarty_Internal_Template->render(false, 0)
in smarty_internal_templatebase.php line 232
at Smarty_Internal_TemplateBase->_execute(object(SmartyDevTemplate), null, 'classiclayouts/layout-full-width.tpl', null, 0)
in smarty_internal_templatebase.php line 116
at Smarty_Internal_TemplateBase->fetch('index.tpl', null, 'classiclayouts/layout-full-width.tpl', null, false, true, false)
in SmartyDev.php line 40
at SmartyDev->fetch('index.tpl', null, 'classiclayouts/layout-full-width.tpl')
in FrontController.php line 704
at FrontControllerCore->smartyOutputContent('index.tpl')
in FrontController.php line 686
at FrontControllerCore->display()
in Controller.php line 326
at ControllerCore->run()
in Dispatcher.php line 518
at DispatcherCore->dispatch()
in index.php line 28

error in admin

Symfony\Component\Debug\Exception\
ClassNotFoundException
in modules/ps_languageselector/ps_languageselector.php (line 32)
use PrestaShop\PrestaShop\Core\Module\WidgetInterface;if (!defined('_PS_VERSION_'))    exit;class Ps_LanguageselectorOverride extends Ps_Languageselector implements WidgetInterface{    public function install()    {        if (!parent::install() || !$this->registerHook('displayNav2'))
require_once()
in src/Adapter/Module/ModuleDataProvider.php (line 248)
ModuleDataProvider->PrestaShop\PrestaShop\Adapter\Module\{closure}('ps_languageselector')
in src/Adapter/Module/ModuleDataProvider.php (line 266)
ModuleDataProvider->isModuleMainClassValid('ps_languageselector')
in src/Core/Addon/Module/ModuleRepository.php (line 478)
ModuleRepository->getModule('ps_languageselector', false)
in src/Core/Addon/Module/ModuleRepository.php (line 570)
ModuleRepository->getModulesOnDisk(false)
in src/Core/Addon/Module/ModuleRepository.php (line 213)
ModuleRepository->getFilteredList(object(AddonListFilter))
in src/Core/Addon/Module/ModuleRepository.php (line 611)
ModuleRepository->getInstalledModules()
in src/Core/Addon/Module/ModuleRepository.php (line 621)
ModuleRepository->getInstalledModulesCollection()
in var/cache/dev/ContainerUqcy2y0/getPrestashop_Core_Form_ChoiceProvider_ModuleByNameService.php (line 8)
require('/var/www/www-root/data/www/xx.com/var/cache/dev/ContainerUqcy2y0/getPrestashop_Core_Form_ChoiceProvider_ModuleByNameService.php')
in var/cache/dev/ContainerUqcy2y0/appDevDebugProjectContainer.php (line 2600)
appDevDebugProjectContainer->load('getPrestashop_Core_Form_ChoiceProvider_ModuleByNameService.php')
in var/cache/dev/ContainerUqcy2y0/getForm_Type_Translations_ModifyService.php (line 8)
require('/var/www/www-root/data/www/xx.com/var/cache/dev/ContainerUqcy2y0/getForm_Type_Translations_ModifyService.php')
in var/cache/dev/ContainerUqcy2y0/appDevDebugProjectContainer.php (line 2600)
appDevDebugProjectContainer->load('getForm_Type_Translations_ModifyService.php')
in var/cache/dev/ContainerUqcy2y0/getForm_RegistryService.php (line 117)
appDevDebugProjectContainer->{closure}()
in vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/ServiceLocator.php (line 64)
ServiceLocator->get('PrestaShopBundle\\Form\\Admin\\Improve\\International\\Translations\\ModifyTranslationsType')
in vendor/symfony/symfony/src/Symfony/Component/Form/Extension/DependencyInjection/DependencyInjectionExtension.php (line 64)
DependencyInjectionExtension->getType('PrestaShopBundle\\Form\\Admin\\Improve\\International\\Translations\\ModifyTranslationsType')
in vendor/symfony/symfony/src/Symfony/Component/Form/FormRegistry.php (line 78)
FormRegistry->getType('PrestaShopBundle\\Form\\Admin\\Improve\\International\\Translations\\ModifyTranslationsType')
in vendor/symfony/symfony/src/Symfony/Component/Form/FormFactory.php (line 74)
FormFactory->createNamedBuilder('form', 'PrestaShopBundle\\Form\\Admin\\Improve\\International\\Translations\\ModifyTranslationsType')
in src/PrestaShopBundle/Form/Admin/Improve/International/Translations/TranslationsSettingsFormHandler.php (line 78)
TranslationsSettingsFormHandler->getForm()
in src/PrestaShopBundle/Controller/Admin/TranslationsController.php (line 104)
TranslationsController->showSettingsAction(object(Request))
in vendor/symfony/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php (line 151)
HttpKernel->handleRaw(object(Request), 1)
in vendor/symfony/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php (line 68)
HttpKernel->handle(object(Request), 1, false)
in vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Kernel.php (line 200)
Kernel->handle(object(Request), 1, false)
in admin673fujfr6/index.php (line 82)

Thank you for your help.