Hello i am trying to install allura template in a joomla 4.4 version and once i made the template default my page is not working.debug says this: Symfony\Component\ErrorHandler\Error\ ClassNotFoundError in C:\xampp\htdocs\drivingbooks.gr\templates\allura\error.php (line 19)

use Joomla\CMS\Uri\Uri;
use Joomla\CMS\Language\Text;
$app = Factory::getApplication();
$doc = Factory::getDocument();
$template = Helper::loadTemplateData();
$params = $template->params;
$fontCSS = '';
function addGoogleFont($fonts)
{

require() in C:\xampp\htdocs\drivingbooks.gr\libraries\src\Document\HtmlDocument.php (line 721) HtmlDocument->_loadTemplate('C:\xampp\htdocs\drivingbooks.gr\templates/allura', 'error.php') in C:\xampp\htdocs\drivingbooks.gr\libraries\src\Document\HtmlDocument.php (line 776) HtmlDocument->_fetchTemplate(array('template' => 'allura', 'directory' => 'C:\xampp\htdocs\drivingbooks.gr\templates', 'debug' => true, 'csp_nonce' => null, 'templateInherits' => '', 'params' => object(Registry), 'file' => 'error.php')) in C:\xampp\htdocs\drivingbooks.gr\libraries\src\Document\HtmlDocument.php (line 612) HtmlDocument->parse(array('template' => 'allura', 'directory' => 'C:\xampp\htdocs\drivingbooks.gr\templates', 'debug' => true, 'csp_nonce' => null, 'templateInherits' => '', 'params' => object(Registry), 'file' => 'error.php')) in C:\xampp\htdocs\drivingbooks.gr\libraries\src\Document\HtmlDocument.php (line 630) HtmlDocument->render(false, array('template' => 'allura', 'directory' => 'C:\xampp\htdocs\drivingbooks.gr\templates', 'debug' => true, 'csp_nonce' => null, 'templateInherits' => '', 'params' => object(Registry), 'file' => 'error.php')) in C:\xampp\htdocs\drivingbooks.gr\libraries\src\Document\ErrorDocument.php (line 139) ErrorDocument->render(false, array('template' => 'allura', 'directory' => 'C:\xampp\htdocs\drivingbooks.gr\templates', 'debug' => true, 'csp_nonce' => null, 'templateInherits' => '', 'params' => object(Registry), 'file' => 'error.php')) in C:\xampp\htdocs\drivingbooks.gr\libraries\src\Error\Renderer\HtmlRenderer.php (line 70) HtmlRenderer->render(object(Error)) in C:\xampp\htdocs\drivingbooks.gr\libraries\src\Exception\ExceptionHandler.php (line 126) ExceptionHandler::render(object(Error)) in C:\xampp\htdocs\drivingbooks.gr\libraries\src\Exception\ExceptionHandler.php (line 72) ExceptionHandler::handleException(object(Error)) in C:\xampp\htdocs\drivingbooks.gr\libraries\src\Application\CMSApplication.php (line 322) CMSApplication->execute() in C:\xampp\htdocs\drivingbooks.gr\includes\app.php (line 61) require_once('C:\xampp\htdocs\drivingbooks.gr\includes\app.php') in C:\xampp\htdocs\drivingbooks.gr\index.php (line 32) Error

Class "HelixUltimate\Framework\Platform\HTMLOverride" not found

I am working in local with xampp-windows-x64-8.2.12-0-VS16.any suggestions to solve the problem?