Attempted to load class "Helper" from namespace "HelixUltimate\Framework\Platform". Did you forget a "use" statement for another namespace?

Get this error with php 8.2.9

Symfony\Component\ErrorHandler\Error\ ClassNotFoundError
in \templates\shaper_helixultimate\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 \libraries\src\Document\HtmlDocument.php (line 741)
HtmlDocument->_loadTemplate('C:\templates/shaper_helixultimate', 'error.php') in \libraries\src\Document\HtmlDocument.php (line 796)
HtmlDocument->_fetchTemplate(array('template' => 'shaper_helixultimate', 'directory' => '\templates', 'debug' => true, 'csp_nonce' => null, 'templateInherits' => '', 'params' => object(Registry), 'file' => 'error.php')) in \libraries\src\Document\HtmlDocument.php (line 613)
HtmlDocument->parse(array('template' => 'shaper_helixultimate', 'directory' => '\templates', 'debug' => true, 'csp_nonce' => null, 'templateInherits' => '', 'params' => object(Registry), 'file' => 'error.php')) in \libraries\src\Document\HtmlDocument.php (line 631)
HtmlDocument->render(false, array('template' => 'shaper_helixultimate', 'directory' => '\templates', 'debug' => true, 'csp_nonce' => null, 'templateInherits' => '', 'params' => object(Registry), 'file' => 'error.php')) in \libraries\src\Document\ErrorDocument.php (line 139)
ErrorDocument->render(false, array('template' => 'shaper_helixultimate', 'directory' => '\templates', 'debug' => true, 'csp_nonce' => null, 'templateInherits' => '', 'params' => object(Registry), 'file' => 'error.php')) in \libraries\src\Error\Renderer\HtmlRenderer.php (line 70)
HtmlRenderer->render(object(RuntimeException)) in \libraries\src\Exception\ExceptionHandler.php (line 121)
ExceptionHandler::render(object(RuntimeException)) in \libraries\src\Exception\ExceptionHandler.php (line 72)
ExceptionHandler::handleException(object(RuntimeException)) in \libraries\src\Application\CMSApplication.php (line 322)
CMSApplication->execute() in \includes\app.php (line 61)
require_once('\includes\app.php') in \index.php (line 32)
RuntimeException

Failed to start the session because headers have already been sent by "\libraries\vendor\joomla\database\src\Mysql\MysqlDriver.php" at line 121.

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